Musnad Ahmad 31:83

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Sa'd al-Ta'i, from 'Atiyyah al-'Awfi, from Abu Sa'id al-Khudri, who said: The Messenger of Allah, peace and blessings of Allah be upon him, mentioned the companion of the Trumpet and said: "On his right is Jibril, and on his left is Mika'il, peace be upon them."