Musannaf Ibn Abi Shayba 8:1343

Abu Bakr narrated to us, he said: Shababa bin Sawwar narrated to us, from Layth bin Sa'd, from Bukayr bin al-Ashajj, from Muhammad bin Abd al-Rahman bin Aslam, from Anas, he said: I prayed with the Prophet, peace and blessings of Allah be upon him, at Mina two rak'ahs, and with Abu Bakr, and with Umar, and with Uthman during the beginning of his caliphate.