Sahih Al Bukhari Hadith Number 728

Narrated Ibn `Abbas: One night I stood to the left of the Prophet (peace be upon him) in the prayer but he caught hold of me by the hand or by the shoulder (arm) till he made me stand on his right and beckoned with his hand (for me) to go from behind (him). (Al-Kashmaihani [??] , Fath-ul-Bari).

10  Call to Prayers (Adhaan)
Hadith number 728
Volume no 1
Chapter: 79 (The right side of the mosque and the place to the right of the Imam)