حَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ، أَخْبَرَنَا شَرِيكٌ، عَنْ خُصَيْفٍ، عَنْ مِقْسَمٍ، عَنِ ابْنِ عَبَّاسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم فِي الرَّجُلِ يَقَعُ عَلَى امْرَأَتِهِ وَهِيَ حَائِضٌ قَالَ ‏"‏ يَتَصَدَّقُ بِنِصْفِ دِينَارٍ ‏"‏ ‏.‏

Ibn Abbas narrated that : the Prophet said about a man who had sexual intercourse with his wife while she is menstruating: "He should give half a Dinar in charity." Translation Not Available

Book Ref: Jamiya Tirmidhi Book 1 Hadith 136
Web Ref:  Jamiya Tirmidhi Vol 1 Book 1 Hadith 136