Sahih Muslim 1675
Anas reported that Umm Haritha, the sister of Rubayyi' (she was the father's sister of Hadrat Anas) injured a person (she broke his teeth). The dispute was referred to Allah's Apostle (ﷺ). Allah's Messenger (ﷺ) said:
Retribution, retribution. Umm Rubayyi' said: Messenger of Allah, will retribution be taken from so and so? By Allah, it shall not be taken from her (i. e. from Umm Haritha). Thereupon Allah's Apostle said: Hallowed be Allah. O Umm Rubayyi', Qisas (retribution is a command, prescribed) in the Book of Allah. She said: No, by Allah, Qisas will never be taken from her; and she went on saying this until they (the relatives of the one who had been injured) accepted the blood-wit. Thereupon Allah's Messenger (ﷺ) said: Verily there are amongst the servants of Allah (such pious persons) who, if they take oath of Allah, He honours it.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَفَّانُ بْنُ مُسْلِمٍ، حَدَّثَنَا حَمَّادٌ، أَخْبَرَنَا ثَابِتٌ، عَنْ أَنَسٍ، أَنَّ أُخْتَ الرُّبَيِّعِ أُمَّ حَارِثَةَ، جَرَحَتْ إِنْسَانًا فَاخْتَصَمُوا إِلَى النَّبِيِّ صلى الله عليه وسلم فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ الْقِصَاصَ الْقِصَاصَ ‏"‏ ‏.‏ فَقَالَتْ أُمُّ الرَّبِيعِ يَا رَسُولَ اللَّهِ أَيُقْتَصُّ مِنْ فُلاَنَةَ وَاللَّهِ لاَ يُقْتَصُّ مِنْهَا ‏.‏ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ سُبْحَانَ اللَّهِ يَا أُمَّ الرَّبِيعِ الْقِصَاصُ كِتَابُ اللَّهِ ‏"‏ ‏.‏ قَالَتْ لاَ وَاللَّهِ لاَ يُقْتَصُّ مِنْهَا أَبَدًا ‏.‏ قَالَ فَمَا زَالَتْ حَتَّى قَبِلُوا الدِّيَةَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّ مِنْ عِبَادِ اللَّهِ مَنْ لَوْ أَقْسَمَ عَلَى اللَّهِ لأَبَرَّهُ ‏"‏ ‏.‏