(103) باب مَا جَاءَ فِي الْكَفَّارَةِ فِي ذَلِكَ
Ibn Abbas narrated that :
the Prophet said about a man who had sexual intercourse with his wife while she is menstruating: "He should give half a Dinar in charity."
Reference: Jami` at-Tirmidhi 136
In-book reference: Book 1, Hadith 136
English translation: Vol. 1, Book 1, Hadith 136