Musannaf Ibn Abi Shayba 27:844

Mu'awiyah ibn Hisham narrated to us, from 'Umar ibn Rashid, from Iyas ibn Salamah, from his father, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Aslam, may Allah keep it safe, and Ghifar, may Allah forgive it."