"A man bit the hand of another man. The man who was bitten pulled his hand out, causing two of his incisors (teeth) to fall out. They brought their case of the Prophet ﷺ. So he said: "One of you bites his brother like the stallion bites? There is no blood-money for you.' So Allah Most High revealed: Wounds, equal for equal."  

أَنَّ رَجُلاً عَضَّ يَدَ رَجُلٍ فَنَزَعَ يَدَهُ فَوَقَعَتْ ثَنِيَّتَاهُ فَاخْتَصَمُوا إِلَى النَّبِيِّ ﷺ فَقَالَ يَعَضُّ أَحَدُكُمْ أَخَاهُ كَمَا يَعَضُّ الْفَحْلُ لاَ دِيَةَ لَكَ فَأَنْزَلَ اللَّهُ (وَالْجُرُوحَ قِصَاصٌ ) قَالَ وَفِي الْبَابِ عَنْ يَعْلَى بْنِ أُمَيَّةَ وَسَلَمَةَ بْنِ أُمَيَّةَ وَهُمَا أَخَوَانِ