(a) Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates from the Prophet (peace and blessings be upon him) concerning "the man who comes to his wife while she is menstruating (what should he do?)" He said: "He should give one dinar or half a dinar in charity." (b) Through various chains, Shu'bah narrates it from Sayyiduna Ibn Abbas (may Allah be pleased with them both) as mawquf (as his own statement).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1511