“and the prophets were sealed by me.” It is reported by Muslim (2/64); al-Tirmidhi (1/293), who declared it sound; al-Bayhaqi (2/433); and Ahmad (2/412). Ahmad also narrates it in the Musnad (2/501) through another, abbreviated chain that is graded hasan (sound). (1) The reference is to the hadith of Abu Saʿid al-Khudri, who said: “The Messenger of Allah ﷺ used to devote himself to retreat (iʿtikaf) during the middle ten nights of Ramadan. One year he remained in retreat until the night of the twenty-first—the night whose dawn customarily marked the end of his seclusion—then announced: ‘Whoever is observing iʿtikaf with me should remain for the last ten nights. I was shown the Night (of Qadr) but then it was made to slip from my memory; yet I saw myself prostrating in its morning in water and mud. So look for it during the last ten nights and seek it on each odd-numbered night.’ “Rain fell that night,” Abu Saʿid continued, “and the mosque roof was made of palm-fronds, so the roof began to leak. I saw with my own eyes the Messenger of Allah ﷺ leave in the morning of the twenty-first with water and mud upon his forehead and nose.” The hadith is recorded by Malik (1/296–298); al-Bukhari via Malik (4/219); Abu Dawud (1/218–219); and al-Bayhaqi (2/103) through the isnad of Yazid b. Abd Allah b. al-Had, from Muhammad b. Ibrahim al-Taymi, from Abu Salama b. Abd al-Rahman, from Abu Saʿid.