Chapter on Breastfeeding
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 3|Chapter 47
وَ رَوَى اَلْحَسَنُ بْنُ مَحْبُوبٍ عَنْ مَالِكِ بْنِ عَطِيَّةَ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: فِي اَلرَّجُلِ يَتَزَوَّجُ اَلْمَرْأَةَ فَتَلِدُ مِنْهُ ثُمَّ تُرْضِعُ مِنْ لَبَنِهَا جَارِيَةً أَ يَصْلُحُ لِوَلَدِهِ مِنْ غَيْرِهَا أَنْ يَتَزَوَّجَ تِلْكَ اَلْجَارِيَةَ اَلَّتِي أَرْضَعَتْهَا قَالَ "لاَ هِيَ بِمَنْزِلَةِ اَلْأُخْتِ مِنَ اَلرَّضَاعَةِ لِأَنَّ اَللَّبَنَ لِفَحْلٍ وَاحِدٍ".
Al-Hasan ibn Mahbub narrated from Malik ibn Atiyyah from Abu Abdullah عليه السلام regarding a man who marries a woman, and she gives birth to his child. Then she breastfeeds a bondwoman with her milk. Imam عليه السلام was asked: "Is it permissible for his child from another woman to marry that bondwoman whom she breastfed?" Imam عليه السلام replied: "No, she is like a sister through breastfeeding because the milk comes from the same father."
- Ṣaḥīḥ al-Faqīh, p. 291