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
Al-Husayn ibn Sa‘id from Safwan from al-‘Ala’ from Muhammad ibn Muslim from one of the two (Imams عليه السلام), peace be upon them:
I asked Him عليه السلام about a man who recites two Surahs in one rak‘ah. Imam عليه السلام said: “No, for each Surah there is a rak‘ah.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 74