The Prophet said concerning one who has intercourse with a woman when she is menstruating: "Let him give a Dinar or half a Dinar in charity."
Sunan Ibn Majah Book 1, Hadith 374
← Previous Hadith "The Messenger of Allah said: 'Whoever has intercourse with a menstruating woman, or with a woman in her rear, or who goes to a fortuneteller and believes what he says, he has disbelieved in that which was revealed to Muhammad.'"

Sunan Ibn Majah Book 1, Hadith 373 Next Hadith → The Prophet said to her, when she was menstruating: "Undo your braids and bathe." (Sahih)(A narrator) 'Ali said in his narration: "Undo your head."

Sunan Ibn Majah Book 1, Hadith 375