Ghusl for Menstruation and Postpartum
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 21
وَقَالَ اَلنَّبِيُّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «مَنْ جَامَعَ اِمْرَأَتَهُ وَ هِيَ حَائِضٌ فَخَرَجَ اَلْوَلَدُ مَجْذُوماً أَوْ أَبْرَصَ فَلاَ يَلُومَنَّ إِلاَّ نَفْسَهُ.
The Messenger of Allah صلى الله عليه وعلى آله وسلم said: 'Whoever has intercourse with his wife while She is menstruating, and if the child born from that union is afflicted with leprosy or vitiligo, he should blame only himself.'
- Ṣaḥīḥ al-Faqīh