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 Hammad ibn ‘Isa, from Muhammad ibn Hamzah ibn Bayd, from Muhammad ibn Muslim, who said:
I asked Abu Ja‘far عليه السلام about the beginning time of the two rak‘ahs of Fajr. Imam عليه السلام said: "The last sixth of the night."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 142