عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فِي الَّذِي يَأْتِي امْرَأَتَهُ وَهِيَ حَائِضٌ ((يَتَصَدَّقُ بِدِينَارٍ أَوْ بِنِصْفِ دِينَارٍ))
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that regarding a man who has intercourse with his menstruating wife, the Noble Prophet (peace and blessings be upon him) said: He should give charity of one dinar or half a dinar.