“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 فَأَتَوَا النَّبِيَّ ﷺ فَأَمَرَ بِالْقِصَاصِ قَالَ أَنَسُ بْنُ النَّضْرِ يَا رَسُولَ اللهِ «تُكْسَرُ ثَنِيَّةُ الرُّبَيِّعُ وَالَّذِي بَعَثَكَ بِالْحَقِّ لَا تُكْسَرُ» قَالَ يَا أَنَسُ «كِتَابُ اللهِ الْقِصَاصُ» فَرَضِيَ الْقَوْمُ وَعَفَوْا قَالَ «إِنَّ مِنْ عَبَّادِ اللهِ مَنْ لَوْ أَقْسَمَ عَلَى اللهِ لَأَبَرَّهُ»  

"My paternal uncle Anas bin An-Nadr - after whom I was named - did not participate in the battle of Badr with the Messenger of Allah ﷺ. This distressed him and he said: 'I was absent from the first battle which the Messenger of Allah ﷺ attended. By Allah! If Allah gives me the opportunity to participate in another battle along with the Messenger of Allah ﷺ, then Allah will see what I will do!'" He said: "He did not want to say more than that. A year later, he attended the battle of Uhud, where he saw Sa'd bin Mu'adh and said: 'O Abu 'Amr where are you going?' He said: 'I long for the fragrance of Paradise and I have found it near the mountains of Uhud.' He fought them until he was killed. They found more than eighty wounds on his body, be they from blows of a sword, puncture wounds, or arrows. My paternal aunt Ar-Ruba'i bin An-Nadr said: 'I could not recognize my brother except by his finger tips.' And this Ayah was revealed: 'Among the believers are men who have been true to their covenant with Allah; of them some have fulfilled their vow, and some of them are still waiting, but they have never changed in the least (33:23).'" (Using translation from Tirmidhī 3200)  

قَالَ عَمِّي أَنَسُ بْنُ النَّضْرِ سُمِّيتَ بِهِ وَلَمْ يَشْهَدْ بَدْرًا مَعَ رَسُولِ اللهِ ﷺ فَكَبُرَ ذَلِكَ عَلَيْهِ وَقَالَ «أَوَّلُ مَشْهَدٍ شَهِدَ رَسُولُ اللهِ ﷺ غُيِّبْتُ عَنْهُ أَمَا وَاللهِ لَئِنْ أَرَانِي اللهُ مَشْهَدًا فِيمَا بَعْدُ لَيَرَيَنَّ اللهُ مَا أَصْنَعُ» قَالَ «وَهَابَ أَنْ يَقُولَ غَيْرُهَا فَشَهِدَ مَعَ رَسُولِ اللهِ ﷺ يَوْمَ أُحُدٍ مِنَ الْعَامِ الْمُقْبِلِ فَاسْتَقْبَلَهُ سَعْدُ بْنُ مُعَاذٍ» فَقَالَ يَا أَبَا عَمْرٍو «أَيْنَ؟» قَالَ «وَاهًا لِرِيحِ الْجَنَّةِ أَجِدُهَا دُونَ أُحُدٍ فَقَاتَلَ حَتَّى قُتِلَ فَوُجِدَ فِي جَسَدِهِ بِضْعٌ وَثَمَانُونَ مِنْ بَيْنِ يَعْنِي ضَرْبَةٍ وَرَمْيَةٍ وَطَعْنَةٍ» فَقَالَتْ عَمَّتِي الرُّبَيِّعُ بِنْتُ النَّضْرِ أُخْتُهُ فَمَا عَرَفْتُ أَخِي إِلَّا بِبَنَانِهِ قَالَ وَأُنْزِلَتْ هَذِهِ الْآيَةُ {مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللهَ عَلَيْهِ فَمِنْهُمْ مَنْ قَضَى نَحْبَهُ وَمِنْهُمْ مَنْ يَنْتَظِرُ وَمَا بَدَّلُوا تَبْدِيلًا} [الأحزاب 23]