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 menstruation: "He should give half a dinar in charity."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2458
Hadith Gradingحکم دارالسلام:صحيح موقوفا، وهذا إسناد ضعيف، شريك سيئ الحفظ، وكذا خصيف بن عبدالرحمن