Narrated from Sayyiduna Anas (may Allah be pleased with him) that his paternal aunt, Rubayyi' bint Nadr, broke the tooth of a slave girl. When she offered blood money to the heirs of that slave girl, they refused to accept it. She requested forgiveness, but they were not willing to forgive either. So the Noble Prophet (peace and blessings be upon him) ordered that retribution (qisas) be carried out. The brother of Sayyiduna Anas’s aunt and his uncle, Sayyiduna Anas bin Nadr (may Allah be pleased with him), came and said: O Messenger of Allah (peace and blessings be upon him)! Will my sister Rubayyi’s tooth be broken? No, by the One Who has sent you with the truth! Her tooth will not be broken. The Messenger of Allah (peace and blessings be upon him) said: O Anas bin Nadr! The Book of Allah demands retribution (qisas). Meanwhile, the aggrieved people forgave her. At that time, the Messenger of Allah (peace and blessings be upon him) said: There are some servants of Allah that if they swear an oath by Allah, He fulfills it for them.