Hazrat Hasan bin Amr says that the mention of saying salam at the end of prayer was made in the presence of Hazrat Shaqiq, so he said: I have prayed behind Hazrat Umar and Hazrat Abdullah, and both of them, at the time of saying salam, used to say: "As-salamu 'alaykum wa rahmatullah, as-salamu 'alaykum wa rahmatullah."