I heard Abu Salih say: ‘Ali ؓ said: I mentioned the daughter of Hamzah (as a potential spouse) to the Messenger of Allah ﷺ and he said: ʿShe is the daughter of my brother through breastfeeding.ʿ
عَلِيٌّ ذَكَرْتُ ابْنَةَ حَمْزَةَ لِرَسُولِ اللهِ ﷺ فَقَالَ إِنَّهَا ابْنَةُ أَخِي مِنَ الرَّضَاعَةِ