Sayyiduna Ibn Umar (may Allah be pleased with them both) divorced his wife while she was in her menstrual period. The Messenger of Allah (peace and blessings be upon him) rejected it, until he divorced her in a state of purity.

Ibrahim (may Allah have mercy on him) said: This menstruation should not be counted in the waiting period (iddah).

Hasan (may Allah have mercy on him) said: If a revocable divorce is given, then there is the right of return and there is no waiting period (‘iddah); if an irrevocable divorce is given, then the waiting period (‘iddah) will be counted.

Hazrat Ibn Sirin (may Allah have mercy on him) narrates that Sayyiduna Ibn Umar (may Allah be pleased with them both) divorced his wife while she was in her menstrual period. Sayyiduna Umar (may Allah be pleased with him) informed the Prophet (peace and blessings be upon him), so he said: "Tell him to take her back, and when she becomes pure, then divorce her." Ibn Umar took her back. I asked: Was this divorce counted? He said: What if I made a mistake?

This narration is also reported on the authority of Yunus bin Jubair, may Allah have mercy on him.

Hazrat Sha'bi (may Allah have mercy on him) narrates that a man came before Shurayh and said that he had given his wife three divorces during her menstrual period. Shurayh said: Have you mixed the lawful with the unlawful and the pure with the impure? Now let her become pure, then let her menstruate again, then she will not be lawful for you until she marries another husband.

Sayyiduna Ibn Umar (may Allah be pleased with them both) divorced his wife while she was in her menstrual period. Sayyiduna Umar (may Allah be pleased with him) mentioned this to the Prophet (peace and blessings be upon him), and he said: "This is not a divorce."

Ibrahim (may Allah have mercy on him) said: If a woman is divorced in a state of purity, she will observe the waiting period of three menstrual cycles, and she will not count the menstruation from which she became pure.