Cohabiting with one’s wife during her menses
Question:-
A person has relations with his wife during her menstrual cycle in spite of knowing that doing so is Haraam. What should he do?
Answer:-
It is necessary for him to make Taubah and Istighfgaar as he has committed a major sin, and it is Mustahab to discharge Sadaqah as well.
References:- Haashiyatut-Tahtaawi Alad Durr Pg.152 Vol.1; Fataawa Rahimiyyah Pg.64 Vol.1