Musannaf Ibn Abi Shaybah

Hazrat Bakr bin Abdullah narrates that once a man came to Hazrat Umar and said that a certain person led us in the Fajr prayer and recited a Surah in which there was a verse of prostration (sajdah). Hazrat Umar asked, "Did he really do that?" The informant replied, "Yes." The next day, Hazrat Umar led the Fajr prayer and recited Surah An-Nahl and Surah Bani Isra'il, and performed sajdah in both.