Sahih Bukhari Volume 3, Book 52, Hadith 2645

حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، أَخْبَرَنَا الْحَكَمُ، عَنْ عِرَاكِ بْنِ مَالِكٍ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ اسْتَأْذَنَ عَلَىَّ أَفْلَحُ فَلَمْ آذَنْ لَهُ، فَقَالَ أَتَحْتَجِبِينَ مِنِّي وَأَنَا عَمُّكِ فَقُلْتُ وَكَيْفَ ذَلِكَ قَالَ أَرْضَعَتْكِ امْرَأَةُ أَخِي بِلَبَنِ أَخِي‏.‏ فَقَالَتْ سَأَلْتُ عَنْ ذَلِكَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ صَدَقَ أَفْلَحُ، ائْذَنِي لَهُ ‏"‏‏.‏

Narrated By 'Aisha : Aflah asked the permission to visit me but I did not allow him. He said, "Do you veil yourself before me although I am your uncle?" 'Aisha said, "How is that?" Aflah replied, "You were suckled by my brother's wife with my brother's milk." I asked Allah's Apostle about it, and he said, "Allah is right, so permit him to visit you."