Sahih Muslim Book 4, Hadith Number 1201.

Chapter : Prostration while reciting the Qur’an.

Abdullah b. Zubair narrated on the authority of his father: When the Messenger of Allah (may peace be upon him) sat in prayer, he placed the left foot between his thigh and shank and stretched the right foot and placed his left hand or his left knee and placed his right hand on his right thigh, and raised his finger.