That his aunt, Ar-Rubai' broke an incisor tooth of a girl. My aunt's family requested the girl's relatives for forgiveness but they refused;
then they proposed a compensation, but they refused. Then they went to Allah's Apostle and refused everything except Al-Qisas (i.e. equality in punishment). So Allah's Apostle ﷺ passed the judgment of Al-Qisas (i.e. equality of punishment). Anas bin Al-Nadr said, "O Allah's Apostle! Will the incisor tooth of Ar-Rubai be broken? No, by Him Who sent you with the Truth, her incisor tooth will not be broken." Allah's Apostle ﷺ said, "O Anas! The prescribed law of Allah is equality in punishment (i.e. Al-Qisas.)" Thereupon those people became satisfied and forgave her. Then Allah's Apostle ﷺ said, "Among Allah's Worshippers there are some who, if they took Allah's Oath (for something), Allah fulfill their oaths."
• Sahih al-Bukhari, 4500
• Sahih al-Bukhari, Vol. 6, Book of Prophetic Commentary on the Qur'an, Hadith 27
• Sahih al-Bukhari, Book of Prophetic Commentary on the Qur'an, Hadith 27