Sunan Ibn Majah 650
سنن ابن ماجه#650Da'ifIt was narrated that Ibn 'Abbas said:"If a man had intercourse with his wife while she was menstruating, the Prophet commanded him to give half a Dinar in charity
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniDaif
Muhammad Fouad Abd al-BaqiDaif
Zubair Ali ZaiDaif
In-book reference: 1:384