Muhammad ibn al-Muthanna narrated to us, Mu'adh ibn Hisham narrated to us, my father narrated to me, on the authority of Yahya ibn Abi Kathir, Abu Salamah ibn 'Abd al-Rahman narrated to us, that Abu Hurayrah narrated to them that the Messenger of Allah, peace and blessings be upon him, said: "When the call to prayer is made, Satan turns away in flight, passing wind with noise, until he does not hear the call to prayer. When the call to prayer is finished, he returns. When the iqamah is given, he turns away. When the iqamah is finished, he returns and whispers between a man and his soul, saying: 'Remember such-and-such, remember such-and-such' — for what he did not remember — until the man remains not knowing how much he has prayed. So if any of you does not know how much he has prayed, let him prostrate two prostrations while sitting."