Imagine one of your ordinary days in which you go out in the morning to go to work or the university or anywhere else. You attend some gatherings. You see men and women around you interacting and greeting on different occasions and in various manners, more frequently shaking hands.

You are a member of this community too, and you also used to greet different people with whom you had interactions every day and perhaps it was not important for you if the person you shake hands with is a man or a woman. But now, as a Muslim, you must know that shaking hands in Islam with the opposite gender is forbidden. If this has raised a question in your mind, we will be discussing the issue here.

Psychological Views on Shaking Hands

As a scientific fact, everything we do, or we say, or any other kind of action we perform via every part of our body from legs up to the eyes, or even any thought passing into our minds has energy in itself. Once we bring something into existence, such as an utterance or an action, hence its specific kind of energy, it will never go to an end; but it is transformed and transferred to different targets, leaving its influence on them and first on ourselves.

Thus in our interactions, we are producing some kind of energy. So when people from the opposite genders confront each other and shake hands or kiss or hug each other, as a kind of greeting, what kind of energy is being interchanged between them?  

The Main Reason Behind the Prohibition of Shaking Hands in Islam

God has put some kind of desire in human’s nature by which the opposite sexes are attracted to each other. When women and men who are non-Mahrams, greet each other in any way involving touching their bodies or looking at one another in such a way that arises this desire, they will be leaving a negative effect on each other; although it may feel pleasant.

Once this instinct is provoked, to satisfy their sensual needs, people may go further in their relationships and may be driven into immoral and sinful acts. The final result would be regret, distrust among people and broken families and other mental and physical consequences. Because in Islam’s viewpoint, sensual desires must only be satisfied among spouses. Due to this and some other reasons we might not know, God has set some rules regarding the quality of relationships between women and men. Following these rules will make concepts like marriage and family meaningful.

We Can Control Ourselves

One might say that we do not have any bad intentions in our relationships with those who are considered non-Mahram for us. We can control our desires when confronting them and nothing sinful happens. But the prophet Mohammad (PBUH) and his family who were the purest ones of all time obeyed these rules too.

They avoided any kind of interaction with non-Mahrams that are considered to be Haram. 
When people came to the prophet for Bay’ah (to swear allegiance), he shook hands with men, and for women, a container of water was brought in which the prophet put his hand and took his hand out and then women put their hands in the water to make their pledge [2]. 

The Islamic Etiquette of Touching, Looking and Talking

A Muslim is only allowed to touch the body of those of the same gender and those of the opposite gender who are Mahram for him/her.
A man can only look at the face and hands of a non-mahram woman if they do not have decorations and on the condition that it is not for pleasure [i]. 

In the Quran, we read: “Say to the believers, that they cast down their eyes and guard their private parts… And say to the believing women, that they cast down their eyes and guard their private parts, and reveal not their adornment, save such as is outward…” (24:30-31). Non-Mahrams must be careful with their speaking, too. In another part of Quran, we read: “…be not abject in your speech, so that he in whose heart is sickness may be lustful, but speak honorable words.” (33:32). In these verses of the Holy Quran, the danger of arousing sexual desires through speaking and looking has been warned. However, there are no limits to touching, looking, and talking between spouses.

And some exceptions may occur. For example, if a doctor of the same gender is not available, one can go to a doctor from the opposite gender and touching and looking is permitted in this case. But only in case of necessity and as much as needed.

How to Avoid Shaking Hands in Islam with Non-mahrams

Most probably it will be hard for you to find an excuse to refuse to shake hands with non-mahrams especially those with whom you had usual interactions before. Because in your society this may result in a misunderstanding about your attitude toward people.

When a non-mahram wants to shake a hand with you, if you politely say that due to religious matters you can't shake hands but you are pleased to meet them, in most cases, they will accept it from you without being offended. This would be better rather than falsely mentioning illness and other things. But if you explained your reason honestly and someone reacted badly, you do not need to bother yourself convincing that person.

To conclude, shaking hands, kissing, hugging, and every other kind of greeting and interaction between non-Mahrams which involves touching and also looking at each other on purpose, and talking with each other in a tempting manner are Haram in Islam.

Notes:
[i] Refer to the article “The Islamic etiquette of looking” for more information.                     

References: 

1. shakin hands in islam
2. Mohammad ibn Jarir Tabari, “Tarikh-e Tabari,” vol.3, p.61-62. 

Responsibility in Islam also covers every action that one is supposed to do as a Muslim and his/her interactions with others. Thus, human beings are responsible towards others including: whoever they interact with, whatever they have been given in this world, the divine duties they are expected to perform, and their surroundings and environment.

The responsibilities of a Muslim towards other human beings were discussed in the first part of the article. Here the focus is on the responsibilities towards some non-humans including divine duties [i] and, the property and belongings.

The Rights of Prayer as One's Responsibility in Islam

The right of the ritual prayer over one is to know that he\she is standing before God. Knowing that one should stand in His presence like a lowly servant who is inclined to approach his lord, and who is fearful and ashamed because of his\her sins, but still hopeful of His mercy [1], is our responsibility in Islam towards our prayers. 

He\she should also magnify Him through stillness, bowing of the head, humbleness of the limbs, yielding of the wing, and by saying the best supplications to Him. Then, one should beseech Him to save him\her from the punishments that he\she deserves for his\her faults and sins [1].

The Rights of Fasting

The right of fasting is to know it as a veil that God has set up over one’s tongue, hearing, and sight, private parts, and stomach, to protect him\her from the Fire. Whoever protects his\her parts of the body with the veil of fasting, can be hopeful to be saved from the punishments and the Fire.

But if one leaves his\her parts of the body to do freely unlawful (Haram) acts (e.g., looking at unlawful things and scenes that incite lust and encourage disobeying God) and does not fear God, he\she won’t be safe anymore [1]. 

The Rights of Pilgrimage

The right of pilgrimage is that one should know that he\she has immigrated from his\her sins to God and is standing in His presence. He\she should also know that it is through the pilgrimage that one’s repentance can be accepted and he\she performs an obligation made incumbent upon him\her by God [1].

The Rights of Charity

Of the rights of charity is to know that it is like storing away with God and is a deposit for which no witness is needed. Hence, it would be better to donate in private other than in public. Also, one should not remind others of what he\she has donated since the charity is like a saving whose benefit returns to the donor.

Otherwise, the same thing might happen to him\her when someone else does him\her a favor. Moreover, reminding others of the charity donated demonstrates the impure intention of the donor; like the tendency to show off or humiliate others [1].  

The rights of Sacrifice [ii]

Of the rights of the offering is to consider it as a way to expose oneself to God’s Mercy. So, one should make offering not for receiving others’ approval, but God’s approval.  Therefore, what others say about the offering should not matter [1].  

The Rights of Property

Of the rights of the belongings and property over one and one's responsibility in Islam towards them are to gain it through lawful (Halal) means, to spend it on lawful (Halal) purposes, and to utilize it such that it brings about blessing and salvation in this world and the Hereafter [1]. Imam Sadiq (AS) said that whoever makes money in unfair ways, he\she will lose it justly [2]. According to Surah Qasas, one should use the wealth that God has granted for doing good to others and preparing for the Hereafter (28:77). 

The property and wealth should be used to get God’s satisfaction. It is narrated from Prophet Muhammad (PBUH) that God will punish those who forget about the poor people among them and keep on raising money [3]. Hence, one should not prefer his\her belongings to his\her spirit such that he\she hesitate to use them for spiritual progression. Otherwise, others will inherit this property after his\her death. If they utilize the inherited property in unlawful (Haram) ways, he\she will also be punished for that. If the inheritors use the inherited property properly, they are the ones who will be rewarded [1].

Notes:
[i] The acts and practices that are obligatory (Wajib) or recommended (Mustahab) in Islam.
[ii] Animal sacrifice for the sake of God.

References:

1. Imam Zayn al-'Abidin (AS), “Treatise On Rights (Risalat al-Huquq)”.
2. S. al-Harrani “Tuhaf al-Uqul”, p. 321.
3. W. al.Hilli, “Tanbih al-khawatir wa nuzhat al-nawazir”, vol. 1, p. 10.