It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that he said: "I divorced my wife in the time of the Messenger of Allah (peace and blessings be upon him) while she was menstruating, and Sayyiduna Umar (may Allah be pleased with him) informed the Messenger of Allah (peace and blessings be upon him) of the matter. So the Messenger of Allah (peace and blessings be upon him) returned Abdullah's wife to him. Then when she became pure, he (peace and blessings be upon him) said: 'Now, if you wish, divorce her, or keep her with you.'"