Musannaf Ibn Abi Shaybah 4815 — A man who forgets a prayer or sleeps

Al-Hasan said: Sayyiduna Samurah bin Jundub and Sayyiduna Imran bin Husayn (may Allah be pleased with them both) differed about a person who forgets to pray. Sayyiduna Imran bin Husayn said: "He should pray it when he remembers it." And Sayyiduna Samurah said: "He should pray it when he remembers it, and (again) in its time on the following day."