وَعَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ
قَالَ: يَا رَسُولَ اللَّهِ هَلْ لَكَ فِي بِنْتِ عَمِّكَ حَمْزَةَ؟ فَإِنَّهَا أَجْمَلُ فَتَاةٍ فِي قُرَيْشٍ فَقَالَ لَهُ: «أَمَا عَلِمْتَ أَنَّ حَمْزَةَ أَخِي مَنِ الرَّضَاعَةِ؟ وَأَنَّ اللَّهَ حَرَّمَ مِنَ الرَّضَاعَةِ مَا حرم من النّسَب؟»
Ali said, “Messenger of God, would you like the daughter of your paternal uncle Hamza, for she is the most beautiful girl in Quraish?” He replied, “Do you not know that Hamza is my foster-brother, and that God has prohibited by reason of fosterage what He has prohibited by reason of genealogy?”
Mishkat al-Masabih 3038, Book 14, Marriage, Hadith 83. 1 min read