Musnad Abu Ya'la al-Mawsili 109:272

Ibn Numayr narrated to us, Abu Mu'awiyah and my father narrated to us, they said: Al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Any believer whom I have insulted or cursed, then make it for him a purification and a reward."