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

As for what was narrated by Muhammad ibn Ya‘qub, from Ali ibn Ibrahim, from his father, from Ibn Abi Umayr, from Ja‘far ibn Ali, who said: I saw Aba al-Hasan عليه السلام, peace be upon him, and He عليه السلام had performed a prostration after the prayer, and He عليه السلام spread his forearms on the ground and pressed his chest to the ground, while still in his clothes.