Ghusl for Menstruation and Postpartum
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 21
وَ سَأَلَ سَلْمَانُ اَلْفَارِسِيُّ رَحْمَةُ اَللَّهِ عَلَيْهِ، أَمِيرَ اَلْمُؤْمِنِينَ عَلَيْهِ اَلسَّلاَمُ: عَنْ رِزْقِ اَلْوَلَدِ فِي بَطْنِ أُمِّهِ فَقَالَ «إِنَّ اَللَّهَ تَبَارَكَ وتَعَالَى حَبَسَ عَلَيْهِ اَلْحَيْضَةَ فَجَعَلَهَا رِزْقَهُ فِي بَطْنِ أُمِّهِ.
Imam Jafar ibn Muhammad Al-Sadiq عليه السلام narrates: Salman al-Farsi (may Allah سبحانه وتعالى have mercy on him) asked Amir al-Mu'minin عليه السلام about the sustenance of the child in its mother's womb. Imam عليه السلام said: 'Indeed, Allah سبحانه وتعالى, Blessed and Exalted, has reserved the menstrual period for it and made it its sustenance in its mother's womb.'
- Ṣaḥīḥ al-Faqīh