Al-Masih ad-Dajjal in the context of Second Coming of Jesus Christ

Eschatology (/ˌɛskəˈtɒlədʒi/ ; from Ancient Greek ἔσχατος (éskhatos) 'last' and -logy) concerns expectations of the end of present age, human history, or the world itself. The end of the world or end times is predicted by several world religions (both Abrahamic and Dharmic), which teach that negative world events will reach a climax. Belief that the end of the world is imminent is known as apocalypticism, and over time has been held both by members of mainstream religions and by doomsday cults. In the context of mysticism, the term refers metaphorically to the end of ordinary reality and to reunion with the divine. Many religions treat eschatology as a future event prophesied in sacred texts or in folklore, while other religions may have concepts of renewal or transformation after significant events.

The Abrahamic religions maintain a linear cosmology, with end-time scenarios containing themes of transformation and redemption. In Judaism, the term "end of days" makes reference to the Messianic Age and includes an in-gathering of the exiled Jewish diaspora, the coming of the Messiah, the resurrection of the righteous, and the world to come. Christianity depicts the end time as a period of tribulation that precedes the second coming of Christ, who will face the rise of the Antichrist along with his power structure and false prophets, and usher in the Kingdom of God. The explicit description of a new earth is primarily found in Christian teachings (this description can be found in Chapter 21 of the Book of Revelation). In later traditions of Islam, separate hadiths detail the Day of Judgment as preceded by the appearance of the Masīḥ ad-Dajjāl, and followed by the descending of ʿĪsā (Jesus), which shall triumph over the false Messiah or Antichrist; his defeat will lead to a sequence of events that will end with the sun rising from the west and the beginning of the Qiyāmah (Judgment Day).

The Second Coming (sometimes called the Second Advent or the Parousia) is the Christian and Islamic belief that Jesus Christ will return to Earth after his ascension to Heaven (the Ascension is said to have occurred about two thousand years ago). The idea is based on messianic prophecies and is part of most Christian eschatologies.

In Islamic eschatology, Jesus (ʿĪsā ibn Maryam) is also believed to return in the end times. According to Islamic belief, he will descend from Heaven to defeat the false messiah (al-Masih ad-Dajjal), restore justice, and reaffirm monotheism. His return is regarded as one of the major signs of the Day of Judgment, and he is viewed as a revered prophet, not divine, in Islamic theology.

The Mahdi (Arabic: ٱلْمَهْدِيّ, romanized: al-Mahdī, lit. 'the Guided'), also Masih al-Mahdi (Arabic: المسيح المهدي, romanized: al-Masīḥ al-Mahdī, lit. 'the Guided Redeemer'), is a messianic figure in Islamic belief. He is comparable to the Christian idea of the return of Jesus and the Mashiach ben David in Judaism. He 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 Muhammad and will appear shortly before Jesus.

The Mahdi is mentioned in several compilations of hadith, but absent from the Quran and the two most-revered Sunni hadith collections (Sahih al-Bukhari and Sahih Muslim). As such, he plays only a marginal role in Sunni Islam and some Sunni theologians have rejected the concept of the Mahdi altogether. However, the Mahdi plays a significant role among Twelver Shias, who believe that the Mahdi is Imam Muhammad al-Mahdi, the twelfth Imam, son of the eleventh Imam Hasan al-Askari (d. 874), who is said to be in occultation (ghayba) by divine will.