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."
Jami` at-Tirmidhi Book 1, Hadith 136
← Previous Hadith the Prophet said: "Whoever engages in sexual intercourse with a menstruating woman, or a woman in her anus, consults a soothsayer, then he has disbelieved in what was revealed to Muhammad."

Jami` at-Tirmidhi Book 1, Hadith 135 Next Hadith → the Prophet said: "When the blood is red then (give) a Dinar. And when the blood is yellow then half Dinar."

Jami` at-Tirmidhi Book 1, Hadith 137