حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الْأَعْمَشِ، عَنِ سَعْدِ بْنِ عُبَيْدَةَ، عَنْ أَبِي عَبْدِ الرَّحْمَنِ السُّلَمِيِّ، عَنْ عَلِيٍّ
رَضِيَ اللَّهُ عَنْهُ قَالَ قُلْتُ: يَا رَسُولَ اللَّهِ مَا لَكَ تَنَوَّقُ فِي قُرَيْشٍ وَتَدَعُنَا قَالَ وَعِنْدَكُمْ شَيْءٌ قَالَ قُلْتُ: نَعَمْ ابْنَةُ حَمْزَةَ قَالَ إِنَّهَا لَا تَحِلُّ لِي هِيَ ابْنَةُ أَخِي مِنْ الرَّضَاعَةِ
O Messenger of Allah (sallallahu alayhi wa sallam), why do you choose to get married from among Quraysh and you ignore us? He said: ‘Have you anybody to suggest?’ I said: Yes, the daughter of Hamzah. The Messenger of Allah (sallallahu alayhi wa sallam) said: ‘She is not permissible for me (to marry), for she is the daughter of my brother through breastfeeding.’.
Musnad Ahmad 585, Book 5, Musnad 'Ali Ibn Abi Talib, Hadith 57. 1 min read