Narrated 'Aisha:

Aflah, the brother of Abi Al-Quais, asked permission to visit me after the order of Al-Hijab was revealed. I said, "I will not permit him unless I take permission of the Prophet about him for it was not the brother of Abi Al-Qu'ais but the wife of Abi Al-Qu'ais that nursed me." The Prophet entered upon me, and I said to him, "O Allah's Apostle! Allah, the brother of Abi Al-Qu'ais asked permission to visit me but I refused to permit him unless I took your permission." The Prophet ﷺ said, "What stopped you from permitting him? He is your uncle." I said, "O Allah's Apostle! The man was not the person who had nursed me, but the woman, the wife of Abi Al-Qu'ais had nursed me." He said, "Admit him, for he is your uncle. Taribat Yaminuki (may your right hand be saved)" 'Urwa, the sub-narrator added: For that 'Aisha used to say, "Consider those things which are illegal because of blood relations as illegal because of the corresponding foster relations."

حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، حَدَّثَنِي عُرْوَةُ بْنُ الزُّبَيْرِ، أَنَّ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ اسْتَأْذَنَ عَلَىَّ أَفْلَحُ أَخُو أَبِي الْقُعَيْسِ بَعْدَ مَا أُنْزِلَ الْحِجَابُ، فَقُلْتُ لاَ آذَنُ لَهُ حَتَّى أَسْتَأْذِنَ فِيهِ النَّبِيَّ ﷺ فَإِنَّ أَخَاهُ أَبَا الْقُعَيْسِ لَيْسَ هُوَ أَرْضَعَنِي، وَلَكِنْ أَرْضَعَتْنِي امْرَأَةُ أَبِي الْقُعَيْسِ، فَدَخَلَ عَلَىَّ النَّبِيُّ ﷺ فَقُلْتُ لَهُ يَا رَسُولَ اللَّهِ، إِنَّ أَفْلَحَ أَخَا أَبِي الْقُعَيْسِ اسْتَأْذَنَ، فَأَبَيْتُ أَنْ آذَنَ حَتَّى أَسْتَأْذِنَكَ فَقَالَ النَّبِيُّ ﷺ " وَمَا مَنَعَكِ أَنْ تَأْذَنِي عَمُّكِ ". قُلْتُ يَا رَسُولَ اللَّهِ إِنَّ الرَّجُلَ لَيْسَ هُوَ أَرْضَعَنِي، وَلَكِنْ أَرْضَعَتْنِي امْرَأَةُ أَبِي الْقُعَيْسِ. فَقَالَ " ائْذَنِي لَهُ فَإِنَّهُ عَمُّكِ، تَرِبَتْ يَمِينُكِ ". قَالَ عُرْوَةُ فَلِذَلِكَ كَانَتْ عَائِشَةُ تَقُولُ حَرِّمُوا مِنَ الرَّضَاعَةِ مَا تُحَرِّمُونَ مِنَ النَّسَبِ.