Musannaf Ibn Abi Shayba 3:2066

Ghundar narrated to us, from Hisham al-Dastawa'i, from Yahya ibn Abi Kathir, from Muhammad ibn Ibrahim ibn al-Harith, that Abu Hurayrah and al-Sa'ib al-Qari used to say: The two prostrations are before speaking and after the taslim.