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 the Prophet (peace and blessings be upon him) recited this verse of Surah Al-Ahzab in this way: "O Prophet! When you people want to divorce your wives, then divorce them at the beginning of their waiting period" (meaning to divorce them in the days of purity, not during menstruation).