Sahih al-Bukhari 5100
Sahih al-Bukhari · Book 67: Wedlock, Marriage (Nikaah) · "..your foster-mothers who gave you suck."
Narrated Ibn `Abbas:
حَدَّثَنَا مُسَدَّدٌ ، حَدَّثَنَا يَحْيَى ، عَنْ شُعْبَةَ ، عَنْ قَتَادَةَ ، عَنْ جَابِرِ بْنِ زَيْدٍ ، عَنِ ابْنِ عَبَّاسٍ ، قَالَ قِيلَ لِلنَّبِيِّ صلى الله عليه وسلم أَلاَ تَزَوَّجُ ابْنَةَ حَمْزَةَ قَالَ " إِنَّهَا ابْنَةُ أَخِي مِنَ الرَّضَاعَةِ " . وَقَالَ بِشْرُ بْنُ عُمَرَ حَدَّثَنَا شُعْبَةُ سَمِعْتُ قَتَادَةَ سَمِعْتُ جَابِرَ بْنَ زَيْدٍ مِثْلَهُ .
It was said to the Prophet, "Won't you marry the daughter of Hamza?" He said, "She is my foster niece (brother's daughter). "