Musnad Ahmad 25:312

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Abu Hamzah, who said: I heard Ibn ‘Abbas saying: "The Messenger of Allah (peace and blessings of Allah be upon him) passed by me while I was playing with the boys, so I hid from him behind a door. He called me and gave me a light slap (or pat) on the back, then he sent me to Mu‘awiyah."