It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said regarding the person who had intimacy with his wife during her menstrual period: "He should give one or half a dinar in charity."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 3428
Hadith Gradingحکم دارالسلام:صحيح موقوقا، وهذا إسناد ضعيف جدا، عطاء العطار ضعيف جدا