Musannaf Ibn Abi Shaybah 38854 — Wiping over the turban: Abu Hanifah

It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) led a prayer in which he added or fell short. When he (peace and blessings be upon him) had given the salam and turned his blessed face towards the people, they said: "O Messenger of Allah (peace and blessings be upon him), has something new occurred regarding the prayer?" He (peace and blessings be upon him) said: "What has happened?" They said: "You have led the prayer in such a way (with something less or more)." He (peace and blessings be upon him) bent his legs and made two prostrations, then gave the salam, turned his blessed face towards the people and said: "If anything new had occurred regarding the prayer, I would have informed you of it. But I am a human being; I forget just as you forget. So when I forget, remind me. And when any of you is in doubt about his prayer, let him strive to determine what is correct (taharri), then complete the prayer on that basis. And when he has given the salam, let him make two prostrations."