Musannaf Ibn Abi Shayba 3:850

Ibn ‘Uyaynah narrated to us, from al-Zuhri, from ‘Urwah, who said: Bashir ibn Abi Mas’ud informed me, from his father, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Gabriel descended and led me in prayer until he counted five prayers."