Musnad Ahmad 30:2972

Waki’ narrated to us, from Sufyan, and ‘Abd al-Rahman, who said: Sufyan narrated to us, from Sa’d ibn Ibrahim, from ‘Abd al-Rahman ibn Hurmuz, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him): "That he used to recite in the Fajr [prayer] on the day of Friday: 'Alif-Lam-Mim. The revelation...' [As-Sajdah: 1] and 'Has there [not] come upon man...' [Al-Insan: 1]."