Musnad Abu Ya'la al-Mawsili 159:108

Ibrahim ibn 'Ar'arah narrated to us, Salm ibn Qutaybah narrated to us, al-Hasan ibn 'Ali al-Hashimi narrated to us, from al-A'raj, from Abu Hurayrah, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Jibril, peace be upon him, commanded me to give sincere advice."