Women have a menstrual flow of minimum of three to a maximum of ten days, and their average menstrual cycle ranger from 26 to 30 days.
A group of the Jews believe that, association with women during their monthly courses is absolutely unlawful and forbidden, even eating with them on the same table was prohibited by them! On the contrary, a group of Christians believe that it makes not much difference whether a woman be in her period or be not. To them association with such women, and even having sexual intercourse with them is of no harm and objection. Pagan Arabs, more or less were affected by the Jewish ideas, and kept themselves aloof from women in their menstrual periods. To this effect some of the Muslims asked the prophet what was to be done concerning the menstruation and the verse (No. 222) came to answer that question.