Setting
Among Allah's slaves, there are some who, if they take an oath by Allah (concerning something), Allah fulfills it
Among Allah's slaves, there are some who, if they take an oath by Allah (concerning something), Allah fulfills it
Anas reported that his aunt, Ar-Rubayyi‘, broke the incisor of a girl. The aunt's family requested the girl's relatives for pardon, but they refused, then they proposed a compensation, but they refused. Then they went to the Messenger of Allah (may Allah's peace and blessings be upon him) and refused everything except retribution. So the Messenger of Allah (may Allah's peace and blessings be upon him) judged that retribution be applied. Anas ibn An-Nadr said: "O Messenger of Allah, will the incisor of Ar-Rubayyi‘ be broken? No, by the One Who sent you with the Truth, her incisor will not be broken." Therefore, the Messenger of Allah (may Allah's peace and blessings be upon him) said: "O Anas, the prescribed law of Allah is retribution." Thereupon, those people agreed on pardon. Then the Messenger of Allah (may Allah's peace and blessings be upon him) said: "Among Allah's slaves, there are some who, if they take an oath by Allah (concerning something), Allah fulfills it."
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.