Musnad Ahmad 658:217

Muhammad ibn Ja'far and Bahz narrated to us, they said: Shu'bah narrated to us, from 'Adi, he said: Bahz said: 'Adi ibn Thabit informed us, he said: I heard al-Bara' ibn 'Azib narrating that the Messenger of Allah (may Allah bless him and grant him peace) said to Hassan ibn Thabit: "Satirize them or mock them, and Jibril is with you." Bahz said: "Mock them and satirize them," or he said: "Satirize them or mock them."