Sahih Muslim Book - 17, Hadith - 3579

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثٌ ح وَحَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ أَخْبَرَنَا اللَّيْثُ عَنْ يَزِيدَ بْنِ أَبِى حَبِيبٍ عَنْ عِرَاكٍ عَنْ عُرْوَةَ عَنْ عَائِشَةَ أَنَّهَا أَخْبَرَتْهُ أَنَّ عَمَّهَا مِنَ الرَّضَاعَةِ - يُسَمَّى أَفْلَحَ - اسْتَأْذَنَ عَلَيْهَا فَحَجَبَتْهُ فَأَخْبَرَتْ رَسُولَ اللَّهِ -صلى الله عليه وسلم- فَقَالَ لَهَا « لاَ تَحْتَجِبِى مِنْهُ فَإِنَّهُ يَحْرُمُ مِنَ الرَّضَاعَةِ مَا يَحْرُمُ مِنَ النَّسَبِ ».

It was narrated from 'Aishah that her paternal uncle through breastfeeding, who was called Aflah, asked for permission to enter upon her, and she did not give him permission to enter until she had put on Hijab. She told the Messenger of Allah (s.a.w). and he said to her: "Do not observe Hijab before him, for what becomes unlawful through breastfeeding is that which becomes unlawful through lineage."