Ghusl for Menstruation and Postpartum
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 21
وَ رُوِيَ: «أَنَّهُ إِذَا جَامَعَهَا وَ هِيَ حَائِضٌ تَصَدَّقَ عَلَى مِسْكِينٍ بِقَدْرِ شِبَعِهِ.
It is reported (from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام ) narrated: 'If a man has intercourse with a woman while She is menstruating, he should give charity to a needy person in an amount sufficient to satisfy their hunger.'.
- Ṣaḥīḥ al-Faqīh