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
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 Ali ibn al-Hakam, from Sayf ibn Umayrah, from Mansur ibn Hazim, who said:
Abu Abdillah عليه السلام instructed me to recite ‘al-Mu‘awwidhatayn’ (‘Surat al-Falaq’ and ‘Surat al-Nas’) in the obligatory prayer.
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 102