Musannaf Ibn Abi Shaybah 38848 — When water reaches two qullahs: Abu

Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: We were coming back with the Prophet (peace and blessings be upon him) from al-Hudaybiyah. The Companions relate that they camped on a sandy mound. Ibn Mas'ud said: the Messenger of Allah (peace and blessings be upon him) said: "Who will guard us?" The narrator said: Sayyiduna Bilal (may Allah be pleased with him) said: "I will!" the Prophet (peace and blessings be upon him) said: "Then we shall sleep." The narrator said: All the people remained asleep until the sun had risen. The narrator said: Some people woke up, among them so-and-so and so-and-so, and among them was Umar bin al-Khattab (may Allah be pleased with him). He said: Then we said: "Talk!" The narrator said: Then the Prophet (peace and blessings be upon him) also woke up and said: "Do as you used to do." The narrator said: So we did so (that is, we prayed). The narrator said: He (peace and blessings be upon him) said: "Whoever forgets a prayer or sleeps through it should do likewise."