Chapter on Breastfeeding
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 3|Chapter 47
وَ كَتَبَ عَبْدُ اَللَّهِ بْنُ جَعْفَرٍ اَلْحِمْيَرِيُّ إِلَى أَبِي مُحَمَّدٍ اَلْحَسَنِ بْنِ عَلِيٍّ اَلْعَسْكَرِيِّ عَلَيْهِ اَلسَّلاَمُ: فِي اِمْرَأَةٍ أَرْضَعَتْ وَلَدَ اَلرَّجُلِ أَ يَحِلُّ لِذَلِكَ اَلرَّجُلِ أَنْ يَتَزَوَّجَ اِبْنَةَ هَذِهِ اَلْمُرْضِعَةِ أَمْ لاَ فَوَقَّعَ عَلَيْهِ اَلسَّلاَمُ "لاَ يَحِلُّ ذَلِكَ لَهُ".
Abdullah ibn Ja'far al-Himyari wrote to Abu Muhammad Al-Hasan ibn Ali Al-Askari عليه السلام asking about a woman who breastfed a man's child. He asked: "Is it permissible for that man to marry the daughter of this wet nurse or not?" Imam عليه السلام responded, "It is not permissible for him."
- Ṣaḥīḥ al-Faqīh, p. 291