حَدَّثَنَا عَبْدُ اللَّهِ بْنُ بَكْرٍ وَمُحَمَّدُ بْنُ جَعْفَرٍ قَالَا حَدَّثَنَا سَعِيدٌ عَنْ قَتَادَةَ عَنْ جَابِرِ بْنِ زَيْدٍ عَنِ ابْنِ عَبَّاسٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أُرِيدَ عَلَى ابْنَةِ حَمْزَةَ أَنْ يَتَزَوَّجَهَا فَقَالَ إِنَّهَا ابْنَةُ أَخِي مِنْ الرَّضَاعَةِ وَإِنَّهُ يَحْرُمُ مِنْ الرَّضَاعَةِ مَا يَحْرُمُ مِنْ النَّسَبِ
مسند امام احمد بن حنبل · Hadith 2490
It was narrated from Ibn 'Abbas (RA) that it was suggested to the Messenger of Allah (PBUH) that he should marry the daughter of Hamzah. He said: "She is the daughter of my brother through breastfeeding, and what becomes mahram (forbidden for marriage) through breastfeeding is that which becomes mahram through blood ties."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020