Abdur Rahman bin Ayman (may Allah have mercy on him) once asked Sayyiduna Ibn Umar (may Allah be pleased with them both) about the issue of divorce during menstruation. Abu Az-Zubair was listening to this conversation. Sayyiduna Ibn Umar (may Allah be pleased with them both) said that he had divorced his wife during her menstruation. Sayyiduna Umar (may Allah be pleased with him) went and informed the Prophet (peace and blessings be upon him) about this. The Prophet (peace and blessings be upon him) said: "Tell him to take her back, then if he wants to divorce her, he should do so during her period of purity." And the Prophet (peace and blessings be upon him) also recited this verse from Surah Al-Ahzab in this manner: "O Prophet (peace and blessings be upon him), when you people divorce your wives, then divorce them at the beginning of their waiting period" (meaning, divorce should be given during the period of purity, not during menstruation).