What Defiles Clothing and the Body
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 17
وَ قَدْ رُوِيَ عَنْ أَمِيرِ اَلْمُؤْمِنِينَ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «لَبَنُ اَلْجَارِيَةِ وَ بَوْلُهَا يُغْسَلُ مِنْهُ اَلثَّوْبُ قَبْلَ أَنْ تَطْعَمَ لِأَنَّ لَبَنَهَا يَخْرُجُ مِنْ مَثَانَةِ أُمِّهَا وَ لَبَنُ اَلْغُلاَمِ لاَ يُغْسَلُ مِنْهُ اَلثَّوْبُ قَبْلَ أَنْ يَطْعَمَ وَ لاَ بَوْلُهُ لِأَنَّ لَبَنَ اَلْغُلاَمِ يَخْرُجُ مِنَ اَلْمَنْكِبَيْنِ وَ اَلْعَضُدَيْنِ.
It has been narrated from The Commander of the Faithful Imam Ali ibn Abi Talib عليه السلام: 'The milk and urine of a baby girl must be washed from clothing before She starts eating solid food because her milk is considered to come from her mother’s bladder. However, the milk and urine of a baby boy do not need to be washed from clothing before he starts eating solid food because his milk is considered to come from his shoulders and arms.'
- Ṣaḥīḥ al-Faqīh