Musnad Abu Ya'la al-Mawsili 151:30

Abu Bakr ibn Abi Shaybah narrated to us, 'Abbad ibn al-'Awwam narrated to us, from Harun ibn 'Antarah, from 'Abd al-Rahman ibn al-Aswad, from his father and 'Alqamah, that they both said: We prayed with Ibn Mas'ud in his house, one of us on his right and the other on his left. And he said: "Thus we prayed with the Messenger of Allah, may Allah bless him and grant him peace."