Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 731
Narrated 'Aisha:
Once Hassan bin Thabit asked the permission of the Prophet to lampoon (i.e. compose satirical poetry defaming) the infidels. The Prophet said, "What about the fact that I have common descent with them?" Hassan replied, "I shall take you out of them as a hair is taken out of dough."
Narrated 'Urwa: I started abusing Hassan in front of 'Aisha, whereupon she said. "Don't abuse him, for he used to defend the Prophet (with his poetry)."