Al-Bara' bin `Azib said (through another chain of sub-narrators):"On the day of Quraiza's (siege), Allah's Messenger (saws) said to Hassan bin Thabit, 'Abuse them (with your poems), and Jibril is with you.'"
Hadith ReferenceSahih Bukhari / The Book of Al- Maghazi / Hadith: 4124
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة