his paternal aunt broke the front tooth of a girl and the Prophet of Allah decreed retaliation. Her brother, Anas bin An-Nadr, said: "Will you break the front tooth of so and so? No, by the One Who sent you with the truth, the front tooth of so and so will not be broken!" Before that, they had asked her family for forgiveness and blood money. When her brother - who was the paternal uncle of Anas and was martyred at Uhud - swore that oath, the people agreed to forgive. The Prophet said: "There are among the slaves of Allah who, if they swear by Allah, Allah fulfills their oath." (Using translation from Nasāʾī 4756)  

أَنَّ عَمَّتَهُ كَسَرَتْ ثَنِيَّةَ جَارِيَةٍ فَقَضَى نَبِيُّ اللهِ ﷺ بِالْقِصَاصِ فَقَالَ أَخُوهَا أَنَسُ بْنُ النَّضْرِ تُكْسَرُ ثَنِيَّةُ فُلَانَةَ؟ لَا وَالَّذِي بَعَثَكَ بِالْحَقِّ لَا تُكْسَرُ ثَنِيَّةُ فُلَانَةَ قَالَ وَكَانُوا قَبْلَ ذَلِكَ سَأَلُوا أَهْلَهَا الْعَفْوَ وَالْأَرْشَ فَلَمَّا حَلَفَ أَخُوهَا وَهُوَ عَمُّ أَنَسٍ وَهُوَ الشَّهِيدُ يَوْمَ أُحُدٍ رَضِيَ الْقَوْمُ بِالْعَفْوِ قَالَ النَّبِيُّ ﷺ «إِنَّ مِنْ عِبَادِ اللهِ مَنْ لَوْ أَقْسَمَ عَلَى اللهِ لَأَبَرَّهُ»  

“Rubai, the paternal aunt of Anas, broke the tooth of a girl and they (her family) asked (the girl's family) to let her off, but they refused. They offered to pay compensatory money, but they refused. So they came to Prophet ﷺ who ordered retaliation. Anas bin Nadr said: 'O Messenger of Allah ﷺ, will the tooth of Rubai' be broken? By the One Who sent you with the truth, it will not be broken!' The Prophet ﷺ said: 'O Anas, what Allah has decreed is retaliation.' So the people accepted that and forgave her. The Messenger of Allah ﷺ said: 'there are among the slaves of Allah those who, if they swear by Allah, Allah fulfills their oath.'” (Using translation from Ibn Mājah 2649)  

كَسَرَتِ الرُّبَيِّعُ ثَنِيَّةَ جَارِيَةٍ فَطَلَبُوا إِلَيْهِمُ الْعَفْوَ فَأَبَوْا فَعُرِضَ عَلَيْهِمُ الْأَرْشُ فَأَبَوْا فَأَتَوَا النَّبِيَّ ﷺ فَأَمَرَ بِالْقِصَاصِ قَالَ أَنَسُ بْنُ النَّضْرِ يَا رَسُولَ اللهِ تُكْسَرُ ثَنِيَّةُ الرُّبَيِّعِ؟ وَالَّذِي بَعَثَكَ بِالْحَقِّ لَا تُكْسَرُ قَالَ «يَا أَنَسُ كِتَابُ اللهِ الْقِصَاصُ» فَرَضِيَ الْقَوْمُ وَعَفَوْا وَقَالَ «إِنَّ مِنْ عَبَّادِ اللهِ مَنْ لَوْ أَقْسَمَ عَلَى اللهِ لَأَبَرَّهُ»