Musannaf Ibn Abi Shaybah 4578 — One who leaves having omitted part

Sayyiduna Mu'awiyah bin Hudayj (may Allah be pleased with him) said: One day the Prophet (peace and blessings be upon him) led the prayer, said the salam and left, while one rak'ah of the prayer still remained. A man went after him and said: "You have forgotten one rak'ah of the prayer." He (peace and blessings be upon him) came back, entered the mosque and ordered Sayyiduna Bilal (may Allah be pleased with him) to call the iqamah. He called the iqamah, and the Prophet (peace and blessings be upon him) led the people in one rak'ah. I told the people about this, and they said: "Do you know who that man was?" I said: "I do not know him, but if I see him I will recognise him." Then, on seeing a man, I said: "This is that man." The people said: "This is Talhah bin Ubaydullah (may Allah be pleased with him)."