Musnad Ahmad 31:58

Abu Sa’id, the freed slave of Banu Hashim, narrated to us, Sulayman ibn Bilal narrated to us, Sharik ibn Abi Namir narrated to us, from ‘Abd al-Rahman ibn Abi Sa’id, from his father, who said: "We went out with the Messenger of Allah, may Allah bless him and grant him peace, on Monday to Quba."