Narrated Sa`id bin Al-Harith: Abu Sa`id led us in the prayer and said the Takbir aloud on arising from the prostration, and on prostrating, on rising again, and on getting up from the second rak`a. Abu Sa`id said, "I saw the Prophet doing the same."
Hadith ReferenceSahih Bukhari / The Book of Adhan (Sufa-tus-Salat) / Hadith: 825
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة