Sahih Al Bukhari Hadith Number 785

Narrated Abu Salama: When Abu Huraira led us in prayer he used to say Takbir on each bowing and rising. On the completion of the prayer he used to say, “My prayer is more similar to the prayer of Allah’s Messenger (peace be upon him) than that of anyone of you.”

10  Call to Prayers (Adhaan)
Hadith number 785
Volume no 1
Chapter: 115 (Itmam At-Takbir (i.e., to end the number of Takbir or to say the Takbir perfectly) on bowing. [See Fath Al-Bari]