Sahih al-Bukhari, Book 28, Hadith 28 (In-Book) ⓘ
A man bit the hand of another man but in that process the latter broke one incisor tooth of the former, and the Prophet forgave the latter.
وَعَضَّ رَجُلٌ يَدَ رَجُلٍ ـ يَعْنِي فَانْتَزَعَ ثَنِيَّتَهُ ـ فَأَبْطَلَهُ النَّبِيُّ صلى الله عليه وسلم.
also referenced under: Hadith 1848 (DarusSalam) & Volume 3, Book 29, Hadith 73 (USC-MSA)