Chapter on the Manner of Prayer, Explanation of the Fifty-One Rak‘ahs; The Order, Recitation, Tasbih in Bowing and Prostration, Qunut, and What is Obligatory and Recommended Therein

And from him, from Muhammad ibn Sinan, from Ishaq ibn ‘Ammar, who said: I heard Abu Abdillah عليه السلام say: “(prophet) Musa ibn ‘Imran عليه السلام, when he prayed, would not turn away (from the prayer) until he had placed his right cheek on the ground and his left cheek on the ground.”