Mahdi (as) is a messianic figure in Islamic eschatology who is believed to appear at the end of times to rid the world of evil and injustice. He is said to be a descendant of Prophet Muhammad (PBUH& HP) who will appear while Jesus Christ (Prophet Isa-ibni Maryam) accompanying him and will lead the believers to rule the world and fill it with justice and peace. This is what the Quran says:

 And We wanted to confer favour upon those who were oppressed in the land and make them leaders and make them inheritors. (Al-Qasas 28:5)

Who is Mahdi (as)? 

The name Mahdi is derived from the Arabic root h-d-y, commonly used to mean "divine guidance". Though Imam Mahdi features in both Shia and Sunni understandings of Islam, they differ in his attributes and status. Among Twelver Shi’as, Mahdi is believed to be the son of the eleventh Imam, Imam Hasan al-Askari (d. 874), and is said to have been on divine occultation (ghaybat) by God’s will. However, the Sunnis assert that he (Imam Mahdi) is a descendant of Lady Fatimah (SA), the daughter of the Prophet Muhammad, and it is unknown whether he was born or not.

What is the View of Muslims About Mahdi (as)?

According to our belief, one of the most extraordinary acts of worship is to wait for the promised saviour, and this waiting means trying to provide the conditions for his reappearance.

In the Shi'a Islam, or the school of Ahlul-Bayt, the eschatological Mahdi was commonly given the epithet al-Qa'im, which can be translated as “he who will rise”, signifying his rise against tyranny in the end of all times. Distinctively Shi'a is the notion of the temporary occultation of Imam Mahdi, whose life has been prolonged by God’s will.

As in above mentioned, the Sunnis also believe in the promised Mahdi and many hadiths about him have been narrated in their books. Abu Dawood quotes Prophet Muhammad (PBUH & HP) as saying: " Mahdi will be from my household, from the descendants of Fatimah”. And another hadith states: “Even if only one day remains [until the doomsday], God will lengthen this day until He calls forth a man from me, or from the family of my house, his name matching mine and his father's name matching that of my father. He will fill the Earth with equity and justice just as it had previously been filled with injustice and oppression”. (Furnish, 2005, p. 14) According to narrations before the arrival of Imam Mahdi, the earth would be filled with chaos. While divisions and civil wars, moral degradation, and worldliness would be prevalent among people, injustice and oppression would be rampant throughout the world. The Dajjal (The Anti-Christ) would appear and will spread decadence and corruption in the world. With an army bearing black banners, which would come to his aid from the east, Imam Mahdi would confront the Dajjal. Jesus would pray behind Imam Mahdi and then will kill the Dajjal. The Sufyani, another representative of the forces of the dark, also features in the traditions. He will rise in Syria before the appearance of Imam Mahdi. When the latter appears, the Sufyani, along with his army, will either be swallowed up en-route to Mecca by the earth by God's command or defeated by Imam Mahdi.

What Role does he have in the Future of Humanity

In Imamiyyah (Twelver Shiism), the largest Shi’a branch, believing in the messianic imam is not merely a part of the creed, but is the pivot. For the Twelver Shi'a, Imam Mahdi was born but disappeared after a while, and he would remain hidden from humanity until he reappears to bring justice to the world at the end of time, a doctrine known as the Occultation. This Imam on occultation is the twelfth imam, named Muhammad, son of the eleventh Imam, Hasan al-Askari. According to the Twelvers, the Mahdi was born in Sammara around 868, though his birth was kept hidden from the public. He lived under his father's care until 874 when the latter was killed by the Abbasids. 

Shi'a scholars have argued that the prolonged lifespan of Imam Mahdi Mahdi is not at all unreasonable given the longevity of  the Prophet Noah, Khidr and Jesus, as well as secular reports about long-lived people. According to scholars Imam Mahdi is viewed as the restorer of true Islam, and the restorer of other monotheistic religions after their distortion and abandonment. He establishes the kingdom of God on earth and Islamizes the whole world. As a matter of fact, in their true form, it is believed, all monotheistic religions are essentially identical to Islam as "submission to God." It is in this sense, that one should understand the allegation that al-Mahdi will impose Islam on everyone. His rule will be paradise on earth, which will last for several years until his decease.[1]

References:

1. (Sachedina, 1981, p. 176-178)

Nowadays, we hear every day that our earth is becoming more and more polluted and that a day will come that our life on this planet will be no longer possible. This is undoubtedly the result of our negligence toward the blessing that God had granted us, the blessing of nature and a clean environment: “It is He who created for you all that is in the earth…” (2:29). We are responsible for whatever is going on in our surroundings and at the same time dependent upon it to be able to live.

It is important to note that at the time of the emergence of Islam, people did not face such complex environmental issues and thus this matter has not been dealt with in depth in Islam. Nevertheless, Islam has emphasized the significance of preserving the environment and provided us with guidelines that help us find solutions for such complexities through the narrations and actions of Prophet Muhammad (PBUH&HP) as well as the twelve infallible leaders (AS). This article is an attempt to summarize these matters for you briefly.

Why should we preserve the environment?

The answer is quite simple, and it reveals the direct correlation between human beings and their surroundings. Preserving the environment equals our own physical and mental wellbeing. Our immediate surrounding is where we are always in touch with, and its quality will inevitably affect our mind and soul. Moreover, we are the ones who make use of the environment to fulfill our needs, and the way we use it will ultimately determine our condition of life.

On the other hand, Allah has made this world in perfect equilibrium and human’s excessive exploitation of natural resources will result in damaging this balance: “And We spread out the earth and cast in it firm mountains, and We grew in it every kind of balanced thing” (15:19). When the balance is disturbed, the result will be the many environmental crises that we are faced with nowadays. These include pollution, global warming, natural resource depletion, waste disposal, climate change, loss of biodiversity, deforestation, ocean acidification, ozone layer depletion, acid rain, water pollution, etc. [1].

How Can We Preserve the Environment?

The problems mentioned above are the result of our irresponsibility toward the blessing of the environment, and this is we that should compensate for it. What follows are some Islamic guidelines for us to observe in our treatment of the environment:

1. Avoid Wastefulness

When you make excessive use of natural resources such as water or what is produced by water such as electricity, the paper that is made through cutting trees, fossil fuels, etc., you put the environment in danger and threaten its durability. Quran also emphasizes the necessity to be moderate in using God’s blessings in this world: “… Eat and drink, but do not waste; indeed, He does not like the wasteful” (7:31).

Moreover, our environment is not restricted to our use only but is a public possession from which every human being has the right to benefit. Therefore, we should be careful not to violate other people’s rights in having a share in the environment through our extravagant exploitation of its resources.

There is a general rule in Islam that bids Muslims not to “cause harm or return harm” [2], meaning that they should act in a way that neither brings inconvenience for others nor undermines their situation. Through wastefulness we bring injustice to both ourselves and other human beings; we consume their share in the environment and damage God’s blessing that was given to us to sustain our livelihood. So, respect yourself as well as your fellow human beings through respecting your surroundings. 

2. Keep your Environment Clean

Think about the environment as your home and keep it clean as you like your home to be neat and tidy. Prophet Muhammad (PBUH&HP) says in a narration that: “Allah is pure and likes purity and cleanliness… therefore, keep where you live in clean” [3]. As it was mentioned above, pollution is one of the most pervasive environmental issues in today’s world; this includes air pollution, water pollution, as well as the excessive amount of waste produced on a daily basis.

Those who have faith in Allah and consider His satisfaction in every instance of their lives must be much more cautious regarding their own or their environment’s cleanliness since as Prophet Muhammad (PBUH&HP) puts: “Cleanliness roots in one’s faith” [4].

Air, water, and soil are the three elements that are the source of life on the earth, which has been mentioned in the Quran as well as narrations [i]&[ii]. It is all the matter of your choice. Keep the air you breathe in clean by choosing to take a walk or public transportation instead of using your car. Preserve the water fresh and pure by avoiding throwing waste in the water, urinating in it, and producing waste water excessively; Imam Ali (AS) emphasizes that water has some inhabitants, so we should not harm them through polluting it [6].

Even at the time of war, Prophet Muhammad (PBUH&HP) forbade his soldiers to pollute or poison their adversary’s city [7]. So, let the soil from which your food is provided remain unpolluted by not throwing waste, especially those that do not dissolve in the environment such as plastic waste, etc.

3. Engage in Green Activities

Plant a tree or bring awareness to people about the environment and the natural crisis that is threatening the earth and its inhabitants. There are many narrations from Prophet Muhammad (PBUH&HP) that highlight the necessity of planting trees. For instance, he says: “If a Muslim plants a tree and a bird, human or another creature eats its fruit, it will be considered as an act of charity from him [by Allah]” [8].

Also, Imam Sadiq (AS) considers planting trees and agriculture as the occupations which bring lawful (Halal) earning for the person performing them [9]. When your surrounding is green, your life will become lively and energetic [iii], and you will become more efficient in your performance.

Conclusion:

Finally, it all depends on you and how you want your future to be like. A green and lively environment is the result of our endeavors to preserve it and to give our posterity the opportunity to enjoy the blessing of God. The message of Islam in this matter is again that of moderation and responsibility which guides human beings to live in perfect equilibrium with the environment. 

Notes:
[i] (25:54), (23:12), (24:45), (30:24), (21:30)

[ii] Imam Sadeq (AS) said: “life in a land where is devoid of these three essential factors is highly difficult and challenging: clean air, fresh and plentiful water, as well as fertile ground” [5]. 

[iii] Imam Ali (AS) said: “looking at the green nature causes freshness, liveliness and vitality” [10].

References:

1. Environment
2. Shaikh al-Hur al-Aamili , Wasail Al-shia , vol. 18, p.32
3. Muhammad ibn Hassan Sheibani, Al-Jame Al-Saghir, vol.1, p.267
4. Muhammad Baqir Majlisi ,Bihar al-Anvar, vol.59, p. 291
5. Ibn Shu'ba al-Harrani, Tuhaf al-Ughul, p.320
6. Muhammad ibn Ali Al-Ehsaei, Avali al-Leali, vol.2, p. 187.
7. Mirza Hussain Tabarsi , Mustadrak al-Wasail, vol. 13, p.26.
8. Muhammad ibn Ya'qub al-Kulayni al-Razi , Usul al-Kafi, vol.5, p.260
9. Shaykh as-Saduq,Uyun Akhbar ar-Reza (AS), vol.2, p. 40