Sahih Muslim 1445
Sahih Muslim · Book 17: The Book of Suckling · The prohibition that results from breastfeeding is related to the issue of the male
'A'isha (Allah be pleased with her) reported:
وَحَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ الْعَنْبَرِيُّ ، حَدَّثَنَا أَبِي ، حَدَّثَنَا شُعْبَةُ ، عَنِ الْحَكَمِ ، عَنْ عِرَاكِ، بْنِ مَالِكٍ عَنْ عُرْوَةَ ، عَنْ عَائِشَةَ ، قَالَتِ اسْتَأْذَنَ عَلَىَّ أَفْلَحُ بْنُ قُعَيْسٍ فَأَبَيْتُ أَنْ آذَنَ، لَهُ فَأَرْسَلَ إِنِّي عَمُّكِ أَرْضَعَتْكِ امْرَأَةُ أَخِي . فَأَبَيْتُ أَنْ آذَنَ لَهُ فَجَاءَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَذَكَرْتُ ذَلِكَ لَهُ فَقَالَ " لِيَدْخُلْ عَلَيْكِ فَإِنَّهُ عَمُّكِ " .
Aflah b. Qu'ais sought permission from me (to enter the house), but I refused to grant him the permission, and he sent me (the message saying): I am your uncle (in the sense) that the wife of my brother has suckled you, (but still) I refused to grant him permission. There came the Messenger of Allah (ﷺ) and I made a mention of it to him, and he said: He can enter (your house), for he is your uncle.