Musannaf Ibn Abi Shayba 3:105

2482. Abd al-Wahhab al-Thaqafi narrated to us, from Ubayd Allah ibn Umar, from Nafi, that Marwan used to appoint Abu Hurayrah as his deputy, and he (Abu Hurayrah) used to complete the takbir. And Ibn Umar used to complete the takbir.