In different cultures or religions, people pay special attention to some specific numbers. For example, numbers 7, 40, and 70 are amongst lucky numbers, and number 13 is known to be a cursed number in some cultures. However, the significance of the number 40 among many cultures and religions is very noticeable. Therefore, this question may arise that what is so special about this number? Can number forty bring luck and happiness to people? Is it a fact or just a superstition? Let’s have a quick look at the background of the number forty in different religions.

Number Forty in Christianity 

Number forty has been mentioned in the Bible in different verses:

1- Jesus (PBUH) fasted "forty days and forty nights" in the Judean desert. (Matthew 4:2, Mark 1:13, Luke 4:2).

2- Forty days was the period from the resurrection of Jesus to the ascension of Jesus (PBUH). (Acts 1:3).

3- Rain fell for "forty days and forty nights" during the Flood (Genesis 7:4). [1] 

Number Forty in Islam 

Number forty is mentioned in the Quran four times: 

1 & 2- Prophet Moses (PBUH) spent 40 days on Mount Sinai, where he received the ten commandments (2: 51, 7: 142).

3- Prophet Moses (PBUH) and his people were lost in the desert for forty years. (5: 26)

4- As mentioned in the Quran, It seems that the age of forty should be the time when a human being is supposed to reach his/her intellectual perfection and understanding of life. This is the time when one can plan the rest of his/her life in a way to gain the most from this world for the hereafter:

“… When he comes of age and reaches forty years, he says, ‘My Lord! Inspire me to give thanks for Your blessing with which You have blessed my parents and me, and that I may do righteous deeds which please You, and invest my descendants with righteousness. Indeed I have turned to you in penitence, and I am one of the Muslims.” (46: 15) 

It is narrated from Prophet Muhammad (PBUH & HP) that “When one becomes forty years old, Allah tells his two guardian angels, ‘From now on, be strict on him and note every small and big deed he does’” [2]. The narration emphasizes that the age of forty shapes the personality of a person, and if he/she is still unable to manage his/her life, it is his/her fault for having wasted his/her life in the wrong way. 

Number Forty in Narrations and the Conduct of Scholars

There are so many narrations from Prophet Muhammad (PBUH & HP) that mention number forty. Here we list a few of these narrations:

1- “He who purifies his faith for Allah for forty days, Allah will flow the springs of wisdom from his heart to his tongue” [3].

 2- “The prayers of the one who drinks wine are not accepted for forty days unless he repents” [4] [i].

 3- “The prayers of a person who gossips would not be accepted for forty days and nights” [5].

Some scholars say that number forty is used to emphasize the significant amount of something.

4- “One who leaves his house to gain a gate of knowledge by which he deviates the wrong towards righteous, or deviance to guidance, his deed is equal to forty years worship of a worshipper” [6].

The Fortieth Day after Burial (Arba’een)

In some cultures, it is a tradition that forty days after a passed-away person’s burial, close relatives and friends gather in a place with the family of the late person and remember the passed-away person and wish peace and patience for his/her family. In this manner, they show the family of the deceased person that they are not alone, and people will help them and support them when required. 

It is based on this tradition, taken from the conduct of the Prophet (PBUH & HP) and his Progeny (AS) that Muslims travel to Karbala on the 40th (Arba’een) martyrdom commemoration of Imam Hussain (AS) and his companions; Not only to sympathize with the household of Prophet (PBUH & HP) on this event, but to show their gratefulness for their courage in preserving the true Islam and the conduct of the Prophet (PBUH & HP). More importantly, Muslims show that the aim of Imam Hussain (AS) is still observed and taken care of. 

Is It OK to Follow the Rules Related to Number Forty? 

Based on the importance that some verses of the Quran and narrations of the Prophet (PBUH & HP) give to number forty, Muslim scholars, especially those who are fond of Islamic mysticism and self-purification, pay special attention to number forty in their conducts and life-style. 

Therefore, there is nothing wrong with trying to benefit from the blessings that the number forty may have. And it is trustworthy because Allah and the Prophet (PBUH & HP) have mentioned it. However, normal human beings do not have a real knowledge of numbers and the wisdom behind them. 

A Logical Interpretation 

As mentioned in a narration earlier, the Prophet (PBUH & HP) says that if you purify your faith for forty days, you will see a great result. [7] The reason is that if one works so hard on his/her spirituality to be able to purify his faith for forty days, it will become a habit for him. Allah says in the Quran, “Be wary of Allah, and Allah will teach you, and Allah has knowledge of all things” (2: 282), which is very much relevant to the mentioned narration. Therefore, one interpretation of doing something for forty days is that whatever you do for this long period, with persistence, will become your habit, and after something becomes a habit, you can easily go on with it for the rest of your life.

Conclusion 

To sum up, there is no such thing as lucky or cursed numbers. And instead of trying to find luck in numbers, one should work hard to develop his personality, spirituality, knowledge, and wisdom. 

But the reason number forty has been mentioned by the Prophet (PBUH & HP), and Islamic scholars might be a symbol of enormousness, meaning that if you persist in doing something for a considerable amount of time, it will become your habit. However, the reason why they insisted on number forty might be because they wanted to spread unique conduct and a specific discipline among the believers. 

Notes:

[i] Some may think that if praying and fasting are not accepted for forty days after drinking, then it will be OK if they do not pray or fast for forty days after they drink. It should be noted that praying and fasting are still compulsory for the person who drinks. However, the sin is counted so huge that they should repent from it, deciding not to commit it again, and say their prayers and perform fasting and other obligations.

References 

1. number in religion
    Al-kafi, Vol 8, P. 108
    Bihar al-Anwar, vol. 67, p. 242
    Mustadrak al-Wasa’il, vol. 17. P. 57
   Al-Kafi, Vol. 6, p. 400
    Amali- e Tousi, p. 118
   Bihar al-Anwar, vol. 67, p. 242
2.  

On Dhu al-Hijjah the 18th AH (March 632 CE), Prophet Muhammad (PBUH & HP), while returning from his last pilgrimage of Hajj named “the Farewell Hajj”, stopped at Ghadir Khumm (a pond) to make an announcement to the pilgrims who had accompanied him in the pilgrimage.

Ghadir Khumm was a place where people (who were about 10 thousand in number) from different lands like Iraq, Syria, and Egypt would part ways. But before they do, Gabriel revealed to the Prophet (PBUH & HP) one of the last verses of Quran. The verse is now called the verse of al-Tabligh (propagation):

يَا أَيُّهَا الرَّسُولُ بَلِّغْ مَا أُنزِلَ إِلَيْكَ مِن رَّبِّكَ وَإِن لَّمْ تَفْعَلْ فَمَا بَلَّغْتَ رِسَالَتَهُ وَاللَّهُ يَعْصِمُكَ مِنَ النَّاسِ إِنَّ اللَّهَ لَا يَهْدِي الْقَوْمَ الْكَافِرِينَ

O Messenger! Communicate that which has been sent down to you from your Lord, and if you do not, you will not have communicated His message (the whole message of Islam), and Allah shall protect you from the people. Indeed Allah does not guide the faithless lot. (The Holy Quran 5:67)

After the verse was revealed to the Prophet (PBUH & HP), he ordered the caravan to stop and ordered those who have passed Ghadir Khumm return and wait until those who had not yet arrived there join them. (1)

After performing the noon prayer, the Prophet (PBUH & HP) made a speech that now is one of the most famous speeches of the Prophet known as Ghadir sermon. Zeid ibn Argham, one of the famous companions of the Messenger (PBUH & HP) said:

“Once, the Messenger of Allah (PBUH & HP) made a speech for us near a pond named Ghadir which is between Mecca and Medina. Firstly, he praised Allah and talked about God and then said: ‘O people! I’m only a human and it is possible that the Apostle of my God (The angel of death) comes to me and I shall accept his invitation (my life ends) and I am leaving you al-Thaqalayn (two great things). The first one is the book of Allah (Quran) in which is guidance and light so follow it and hold fast to it.’ he advised us about the Book and encouraged us to follow it. Then the Prophet (PBUH) said: ‘and (the second one is) my close family.  By Allah, I advise you (to follow) my family, By Allah, I advise you (to follow) my family, By Allah, I advise you (to follow) my family’” (2) 

The Hadith above is known as “al-Thaqalayn”. It is one of the most famous Hadiths of the Prophet (PBUH & HP) which indicates that the most important things which the Prophet has left for all Muslims are Quran and the family of the Prophet. 

Bara’ ibn Azib, another famous companion of the Messenger, narrates the continuation of the Hadith: 

“Then the Prophet raised Ali’s hand (so that all people can see it) and said: ‘don’t you know that I am more deserved to the leadership of the believers than themselves?’. People said: ‘yes, we know’. The Prophet said again: ‘don’t you know that I am more deserved to be the leader of every believer than themselves?’. People said: ‘yes, we know’. Then the Prophet said: ‘anyone whose Mawla is me, then Ali is his Mawla. O God! Be friends with his friends and be enemy of his enemies’. Then, Umar ibn Khattab (the second Caliph) met Ali and told him:

‘Congratulations to you, Congratulations to you, you just got the Mawla of every believer, men or women’” 

Arna’oot, one of the most important religious Sunni researchers admits that this historical record is right and trustable. (3)

What does the word “Mawla” mean?

The word “Mawla” in Arabic language has lots of meanings. Shias and Sunnis disagree on the meaning of the word used in this hadith. 

Sunni viewpoint 

Sunni scholars mostly refuse to believe that the word “Mawla”, used in the Hadith, means “Leader” or “Prior in making decisions for somebody”. They rather suggest it means “friend or helper”. They argue that this word is never used in this meaning (Leader). 

Shiite viewpoint 

Shiites, in reply to Sunni scholars, say that this world have actually been used in this meaning (“the prior”) and some Sunni scholars have admitted that. (4) also, some experts in Arab literature admitted so too like Ghiyath Barghuth, Ajjaj (5), Yahya ibn Ziad al-Farra, Akhfash and so forth. (6)

To prove that the word Mawla in this Hadith means “Leader” and not “friend”, there are many evidences but we mention just one in this text. 

The congratulation of Umar ibn Khattab:

The congratulation of Umar ibn Khattab can be a good evidence to prove that “Mawla” here doesn’t mean “friend”. Because, as we said before, Umar says: “Congratulations to you, you just got the Mawla of every believer, men or women” while Imam Ali was the friend of every believer before the Ghadir event, and it doesn’t make sense that he just got the friend of believers in there. 

Ghazali, one of the most important reflective Sunni scholars in this regard, says:

“(After the sermon) Umar said: ‘Congratulations O Aba al-Hassan (Imam Ali (AS) ), you just got my friend and every believer’s friend’. So this shows submission and satisfaction (that Imam Ali is the successor of the Prophet) but after this event, due to his desire and love for power, he made himself Caliph and leader” (7) 

Revelation of the Ikmal verse

People had not scattered yet, when Gabriel one more time came to the Prophet and revealed another verse to him:

الْيَوْمَ يَئِسَ الَّذِينَ كَفَرُوا مِن دِينِكُمْ فَلَا تَخْشَوْهُمْ وَاخْشَوْنِ الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الْإِسْلَامَ دِينًا

Today the faithless have despaired of your religion. So do not fear them, but fear Me. Today I have perfected your religion for you, and I have completed My blessing upon you, and I have approved Islam as your religion.

The narrators of the Hadith 

The Hadith is that which is frequently narrated by different people and historians that no one can deny its authenticity. 

The family of the Prophet i.e. Imam Ali himself, Lady Fatima, Imam Hassan and Imam Hussain are among the narrators of this Hadith. Also many of the companions of the Messenger narrated this Hadith. Kattani, one of the Sunni scholars, says that about 30 companions of the Prophet narrated this story including: Umar ibn Khattab, Zeid ibn Argham, Abi Hurairah, Sa’d ibn Waghas and etc. (8) 

Due to this fact that this Hadith is so frequently narrated, it is called “Mutavatir”, meaning that this Hadith is undeniable. 

Eid al-Ghadir

Shi'as have always regarded the Day of Ghadir as one of the greatest Eids and this day is known to them as Eid al-Ghadir. Imam Sadiq (AS) says that the Eid al-Ghadir is the greatest Eid of Allah. Its name in skies is “the day of Promise” and in the earth “the day of Covenant”. (9)
Shiites believe that this day was the day that Imam Ali (AS), our first Imam, was officially announced to be the successor of the Prophet (PBUH & HP). So this day is a great holiday for them and fasting in it is so recommended. In this day, Shiites go to the house of Seyyed people -the descendants of Imam Ali and Lady Fatimah- and congratulate them. In return, Seyyed people give them gifts. It is highly recommended to conduct parties in this day and give food to the needy ones.

For more information about Ghadir Khumm, you can read the book al-Ghadir, by Allamah al-Amini (Arabic). 

Resources 

1. At-Tafsir, al-Ayyashi, vol.1, Pg.332 
2. Sahih al-Muslim, vol.4, Pg.1873
3. Musnad ibn Hanbal, published by ar-Risalah, vol.30, Pg.430
4. Sharh al-Maqasid, al-Taftazani, vol.5, Pg.273
5. Al-Shfi, Sharif al-Murtaza, vol.2,  Pg.270
6. At-Tafsir al-Kabir, Fakhr ad-Din ar-Razi, vol.29, Pg.227
7. Sir al-A’lamin, al-Ghazali, vol.1, Pg.18
8. Nazm al-Mutanathir, al-Kattani, vol.1, Pg.194
9. Vasa’il ash-Shiah, Sheik Hurr al-A’meli, vol.5, Pg.224