Musannaf Ibn Abi Shayba 3:1983

Zayd ibn al-Hubab narrated to us, from Abd al-Rahman ibn Shurayh, who said: Wahib al-Mu'afiri narrated to me, from Aws ibn Bishr, who said: I saw Uqbah ibn Amir recite the prostration (sajdah) while on the pulpit, then he descended.