Among Allah's slaves, there are some who, if they take an oath by Allah (concerning something), Allah fulfills it
عن أنس أن الرُّبَيِّعَ عمته كَسَرَتْ ثَنِيَّةَ جارية، فطلبوا إليها العفو فأبوا، فعرضوا الأرْشَ فأبَوْا، فأتوا رسول الله صلى الله عليه وسلم وأبوا إلا القصِاَصَ فأمر رسول الله صلى الله عليه وسلم بالقصاص، فقال أنس بن النضر: يا رسول الله أَتُكْسَرُ ثَنِيَّةُ الرُّبَيِّعِ؟ لا والذي بعثك بالحق لا تُكسر ثنيتها. فقال رسول الله صلى الله عليه وسلم : «يا أنسُ، كتابُ اللهِ القصاصُ». فرضي القومُ فَعَفَوْا، فقال رسول الله صلى الله عليه وسلم : «إن من عباد الله من لو أقسم على الله لأبَرَّهُ».
Explanation
This Hadīth indicates that Ar-Rubayyi‘ (may Allah be pleased with her) broke some of the front teeth of a girl from the Ansār. So the Prophet (may Allah's peace and blessings be upon him) wanted that retribution be inflicted upon her, such that her equivalent front teeth be broken. However, her brother Anas ibn An-Nadr asked rhetorically, not denying the judgment of Allah, whether her teeth should be broken. He swore, out of good faith in Allah, that her teeth would not be broken.
Nevertheless, the Prophet (may Allah's peace and blessings be upon him) reminded him that the divine judgment entails retribution. So when the victim's family saw that, they agreed to accept the compensation and gave up retribution. Hence, the Prophet (may Allah's peace and blessings be upon him) said that among the slaves of Allah, there are some people who, if they swear an oath, Allah fulfills it for them, owing to their righteousness and trust in Allah.
Source
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