The Ruling on Divorce During Menstruation

Question:
May Allah reward you. If a man divorces his wife on the last day of her menstruation, does she count that period as part of her waiting period, or does she wait out a new period?

Answer:
Even if he divorced her on the first day of her menstruation, it is all the same; she does not count the period in which the divorce occurred as part of her waiting period. He is required to take her back, as happened with Ibn 'Umar (may Allah be pleased with him). When he divorced her during her menstruation, the Prophet (peace and blessings be upon him) ordered him to take her back. If he divorces her during menstruation, the divorce is forbidden and he commits a sin. He must take her back and keep her until she menstruates, then becomes pure, and then, if he wishes, he may divorce her without touching her, as stated in the hadith.
During menstruation, she does not count this period as part of the waiting period; she must wait for three new periods.