Musnad Ahmad 658:225

Abu Mu'awiyah narrated to us, Al-Shaybani narrated to us, from 'Adi ibn Thabit, from Al-Bara' ibn 'Azib, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said to Hassan ibn Thabit: "Satirize the polytheists, for Jibril is with you."