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 Fadalah, from Aban, from Isma‘il ibn al-Fadl. He said: I asked Abu Abdillah عليه السلام, about what I should say in my witr. He said: “Whatever Allah سبحانه وتعالى causes to be spoken on your tongue and has decreed.”