(a) It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "When a man has intercourse with his wife while she is menstruating, he should give half a dinar in charity."
(b) The Shaykh said: Sharik narrated it and was in doubt about its being marfu'. Imam al-Thawri narrated it from Ali bin Badhimah and Khusayf as mursal.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1519