The Book of Suckling
17/2. Chapter:
The prohibition that results from breastfeeding is related to the issue of the male
Sahih Muslim
وَحَدَّثَنَاهُ عَبْدُ بْنُ حُمَيْدٍ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ جَاءَ أَفْلَحُ أَخُو أَبِي الْقُعَيْسِ يَسْتَأْذِنُ عَلَيْهَا . بِنَحْوِ حَدِيثِهِمْ وَفِيهِ " فَإِنَّهُ عَمُّكِ تَرِبَتْ يَمِينُكِ " . وَكَانَ أَبُو الْقُعَيْسِ زَوْجَ الْمَرْأَةِ الَّتِي أَرْضَعَتْ عَائِشَةَ .
This hadith has been narrated on the authority of Zuhri with the same chain of transmitters (that 'A'isha said): There came Aflah, the brother of Abu'l Qulais (Allah be pleased with him), and sought permission from her, the rest of the hadith is the same (except for the words that the Holy Prophet) said:" He is your uncle. Let your hand be besmeared with dust. Abu'l Qulais was the husband of the woman who had suckled 'A'isha (Allah be pleased with her).
Reference : Sahih Muslim 1445dIn-book reference : Book 17, Hadith 7USC-MSA web (English) reference : Book 8, Hadith 3400