Musannaf Ibn Abi Shayba 3:3065

Abu Khalid al-Ahmar narrated to us, from Hajjaj, from Abu Farwah, from Abu al-Ahwas, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to recite in the morning prayer on Friday: "Alif-Lam-Mim. The revelation..." (Surah as-Sajdah) and a Surah from the Mufassal.