Musannaf Ibn Abi Shaybah 4818 — A man who forgets a prayer or sleeps

Ibrahim said: "If a person forgets to pray, or remains asleep through the time of a prayer, he should pray it whenever he remembers it, even at sunrise or sunset." Then he recited this verse: "And establish prayer for My remembrance" [Ta Ha: 14]. Then he said: "When you remember it, pray it, whatever time it may be."