Sahih al-Bukhari 6153
Book 78: Good Manners and Form (Al-Adab) · Narrated by Al-Bara
Arabic
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا شُعْبَةُ، عَنْ عَدِيِّ بْنِ ثَابِتٍ، عَنِ الْبَرَاءِ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ لِحَسَّانَ " اهْجُهُمْ ـ أَوْ قَالَ هَاجِهِمْ ـ وَجِبْرِيلُ مَعَكَ ".
English translation
Narrated Al-Bara:The Prophet (ﷺ) said to Hassan, "Lampoon them (the pagans) in verse, and Gabriel is with you
Reference: Sahih al-Bukhari 6153, Book of Good Manners and Form (Al-Adab). English translation by Dr. Muhammad Muhsin Khan.