Sahih al-Bukhari 6670

Adam ibn Abi Iyas narrated to us; Ibn Abi Dhi'b narrated to us, from al-Zuhri, from al-Araj, from Abdullah ibn Buhaynah, who said: The Prophet, peace and blessings be upon him, led us in prayer and stood up after the first two units without sitting. He continued his prayer. When he had completed it, the people waited for him to say the salutation, but he prostrated before saying it. Then he raised his head, said the takbir and prostrated, then raised his head and said the salutation.