ENOfficial
Narrated Ibn `Abbas (RAA): Allah's Messenger (Peace be upon him) said regarding a husband who has sexual intercourse with his wife during her menstruation period, "He must pay a Dinar or half a Dinar in way of charity.”
Source: sunnah.com
Other translations
Arabic
وَعَنِ اِبْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا, عَنِ اَلنَّبِيِّ - صلى الله عليه وسلم --فِي اَلَّذِي يَأْتِي اِمْرَأَتَهُ وَهِيَ حَائِضٌ- قَالَ: { يَتَصَدَّقُ بِدِينَارٍ, أَوْ نِصْفِ دِينَارٍ } رَوَاهُ اَلْخَمْسَةُ, وَصَحَّحَهُ اَلْحَاكِمُ وَابْنُ اَلْقَطَّانِ, وَرَجَّحَ غَيْرَهُمَا وَقْفَه ُ 1 .
sunnah.com