Sahih Bukhari
Characteristics of Prayer
Volume: 001 / Book Number: 012 / Hadith Number: 788
Narrated Said bin Al-Harith:
Abu Said 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 Said said, "I saw the Prophet doing the same."