Nafi’ (may Allah have mercy on him) says that once Sayyiduna Ibn Umar (may Allah be pleased with them both) gave his wife a divorce while she was in her menstrual period. Sayyiduna Umar Farooq (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him) about this issue, so the Prophet (peace and blessings be upon him) ordered that he should take her back and wait until she has her menstrual period again and then wait until she becomes pure, then before approaching his wife, he may divorce her. This is the method according to which Allah has given men permission to divorce their wives. It was the practice of Sayyiduna Ibn Umar (may Allah be pleased with them both) that when he was asked about a person who divorces his wife during her menstrual period, he would say: I had given my wife one or two divorces, and the Prophet (peace and blessings be upon him) ordered me to take my wife back and wait for the next menstrual period and then for her to become pure, then before approaching her, to divorce her. Whereas you have given your wife three divorces; you have disobeyed the command of Allah which He has given you regarding divorcing your wife, and your wife has become unlawful for you until she marries another man besides you.