Islamic eschatology unfolds in two clearly distinguished phases: what happens in the interval between this life and the Day of Judgment (Barzakh), and what happens after the general resurrection. The first is private; the second is cosmic. Both are fiercely specific in the Qur'an and the Hadith.
At death, the soul is taken by the angel of death, 'Azra'il (or Malak al-Mawt), and the believer's soul is drawn out as easily as water from a waterskin while the unbeliever's is pulled out with difficulty, as if through thorns. Almost immediately the deceased is questioned in the grave by two angels, Munkar and Nakir, who sit him up and ask three questions: Who is your Lord? What is your religion? Who is this man (the Prophet)? The righteous answer, and the grave becomes a "garden of the gardens of Paradise" until the Resurrection. The wicked fail, and the grave becomes a "pit of the pits of the Fire." This is Barzakh — not a neutral waiting room, but a preliminary state where the shape of the final judgment is already tasted.
Then comes al-Qiyamah, the Day of Standing. The Qur'an describes the resurrection in vivid detail: the trumpet of Israfil sounds; every human being who has ever lived stands naked under an unbearable sun; a book is given into the right hand of the saved and the left hand of the damned; deeds are weighed on a balance, mizan, whose needle is exact. Every human must cross the Sirat — a bridge over Jahannam (hell) described variously as thinner than a hair and sharper than a sword's edge. The righteous pass swiftly. The wicked fall into the fire below.
Jahannam is graded. Seven layers each correspond to specific categories of wrongdoers, from hypocrites at the bottom (the deepest level) upward through pagans, the people of the book who refused the truth, and so on. Jannah, paradise, is graded similarly — eight gates, multiple levels, the highest being Firdaws, closest to the throne of Allah. The rewards are famously sensory: rivers of milk and wine and honey that does not intoxicate, gardens beneath which rivers flow, fruit that does not tire the pickers, spouses of matching purity. The Qur'an refuses to let paradise be merely spiritual; it is felt, tasted, embodied.
The tradition makes central a mercy that runs alongside the justice. Muslims who committed grave sins may enter the fire for purification before being brought to paradise; the Prophet is given a unique power of intercession (shafa'ah) at the Day of Standing. Only shirk — association of partners with God — is described as definitively unforgivable. Everything else can be atoned for, forgotten by the Judge, washed clean.
What distinguishes Islamic eschatology is the tightness of the moral accounting combined with the vastness of the mercy. Every atom's weight of good and every atom's weight of evil is preserved and weighed; and yet Allah is described as the Most Merciful, the Most Compassionate, and the narrow bridge is crossed by more than would be expected under strict justice alone.
