Whoever takes into account that impurity is a rule of nature, so is menstruation, and he said that fasting is a divine ascription. He established every matter in its proper place, and said that fasting is valid for the impurity woman and for the woman who has been pure from menstruation before dawn, if she delays washing and does not purify herself until after dawn, and it is the first to take into account what wisdom requires of giving to everyone who has a right. His truth, for the Wise Almighty says: He gave everything its creation and then guided it, that is, he clarified and praised God with this saying when he related it on the authority of Moses that he said it to Pharaoh, and God Almighty did not offend him in this saying as he offended those who said that God is poor and that God is the third of three.