Sahih Bukhari
Sahih Bukhari Volume 001, Book 012, Hadith Number 766.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 12. Charecteristics Of Prayer
Narated By Al-Bara' : The bowing, the prostrations, the period of standing after bowing and the interval between the two prostrations of the Prophet used to be equal in duration.