Muhammad ibn Mihran al-Razi narrated to us, al-Walid ibn Muslim narrated to us, al-Awza'i narrated to us, from Yahya ibn Abi Kathir, from Abu Salama, that Abu Hurayrah used to say "Allahu akbar" in prayer every time he raised and lowered. So we said, "O Abu Hurayrah, what is this takbir?" He said, "Indeed, this is the prayer of the Messenger of Allah, peace and blessings be upon him."