I heard the Messenger of Allah ﷺ say to Hassan bin Thabit, "Compose satire against them," or "Lampoon them, and Jibreel is with you."
سمعت رسول الله ﷺ يقول لحسان بن ثابت: اهجهم، أو هاجهم، وجبريل معك.
Bukhari narrated it in Adab (6153), and Muslim in Fadail al-Sahabah (2486), both through Shubah, from Adi bin Thabit, "I heard Bara bin Azib," and he mentioned it.