Musnad Abu Ya'la al-Mawsili 247:19

Ahmad, meaning Ibn Ibrahim al-Dawraqi, narrated to us, Abu Dawud narrated to us, Shu'bah narrated to us, from Ali ibn Zayd, from al-Mughirah ibn Abi Barzah, from his father, who said: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "Ghifar, may Allah forgive them; and Aslam, may Allah grant them peace. It is not I who said it, but Allah said it."