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 al-‘Abbas ibn Ma‘ruf from Hammad ibn Isa from Mu‘awiyah ibn ‘Ammar who said: I said to Abu Abdillah عليه السلام: “What is the lightest (minimum) amount of ‘tasbih’ in prayer?” Imam عليه السلام said: “Three ‘tasbihat’ with calm and clear recitation (‘tarassul’), saying: ‘Subhan Allah, Subhan Allah, Subhan Allah’.”