Prayer (Kitab Al-Salat): Details of Commencing Prayer
Dawud :: Book 3 : Hadith 745
Narrated AbuHurayrah:
If I were in front of the Prophet (peace_be_upon_him), I would see his armpits. Ibn Mu'adh added that Lahiq said: Do you not see, AbuHurayrah could not stand in front of the Prophet (peace_be_upon_him) while he was praying. Musa added: When he uttered the takbir, he raised his hands.