‘Abd ar-Rahman b. ‘Auf said that he heard God’s Messenger say,“If any of you prays a prayer and is in doubt whether it is deficient, he should go on praying till he begins to wonder whether he has not prayed too much.”
Imran b. Husain said that God’s Messenger prayed the afternoon prayer and gave the salutation at the end of three rak'as, then went into his house. A man called al-Khirbaq who had long arms got up and went to him, and addressing him mentioned to him what he had done. He came out angrily trailing his cloak, and when he came to the people he asked, “Is this man telling the truth?” When they told him that he was, he prayed a rak‘a, then gave the salutation, then made two prostrations, then gave the salutation.
Ibn ‘Abbas said that the Prophet prostrated himself when an-Najm (Al-Qur'an; 53) was revealed, and the Muslims, the ploytheists, jinn and men prostrated themselves along with him.
Al-Mughira b. Shu'ba reported God’s Messenger as saying, “When an imam stands up at the end of two rak'as, if he remembers before standing straight up he should sit down, but if he stands straight up he must not sit down, but perform the two prostrations of forgetfulness.”
