Abdullah bin Umar (may Allah be pleased with them both) narrates that I divorced my wife during her menstruation in the time of the Messenger of Allah (peace and blessings be upon him). Umar (may Allah be pleased with him) mentioned this to the Messenger of Allah (peace and blessings be upon him), so the Messenger of Allah (peace and blessings be upon him) said: Command him to take her back until she becomes pure, then she experiences menstruation again, and when she becomes pure, if he wishes, he may keep her, and if he wishes, he may divorce her before having intercourse with her. This is the waiting period about which Allah Almighty has commanded that women should be divorced in it.