Musannaf Ibn Abi Shayba 3:2124

Muhammad ibn Bishr narrated to us, he said: Mis'ar narrated to us, from Thabit ibn 'Ubayd, he said: I prayed behind al-Mughirah ibn Shu'bah, and he stood up in the two rak'ahs and did not sit. When he finished, he prostrated two prostrations.