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 Abu Ishaq al-Nahawandi, from Ahmad ibn ‘Umar, from Muhammad ibn Sinan, from Ishaq ibn ‘Ammar, who said: I heard Abu Abdillah عليه السلام say: “When you remember the blessing of Allah سبحانه وتعالى upon you and you are in a place where no one sees you, then place your cheek on the ground. But if you are among a group of people, then place your hand on the lower part of your abdomen, bend your back slightly, and let it be an act of humility before Allah سبحانه وتعالى, for that is more beloved. And let it appear as though it is a cramp you are feeling in your lower abdomen.”