By Allah, I would not permit Aflah unless I have solicited the opinion of Messenger of Allah ﷺ for Abu Qulais has not suckled me, but his wife has given me suck. 'A'isha' (Allah be pleased with her) said: When Messenger of Allah ﷺ entered, I said: Messenger of Allah, Aflah is the brother of Abu'l-Qulais; he came to me to seek my permission for entering (the houst). I did not like the idea of granting him permission until I had solicited your opinion. Thereupon Allah's Apostle ﷺ said: Grant him permission. 'Urwa said it was on account of this that 'A'isha used to say. What is unlawful by reason of consanguinity is unlawful by reason of fosterage.
أَنَّهُ جَاءَ أَفْلَحُ أَخُو أَبِي الْقُعَيْسِ يَسْتَأْذِنُ عَلَيْهَا بَعْدَ مَا نَزَلَ الْحِجَابُ وَكَانَ أَبُو الْقُعَيْسِ أَبَا عَائِشَةَ مِنَ الرَّضَاعَةِ قَالَتْ عَائِشَةُ فَقُلْتُ وَاللَّهِ لاَ آذَنُ لأَفْلَحَ حَتَّى أَسْتَأْذِنَ رَسُولَ اللَّهِ ﷺ فَإِنَّ أَبَا الْقُعَيْسِ لَيْسَ هُوَ أَرْضَعَنِي وَلَكِنْ أَرْضَعَتْنِي امْرَأَتُهُ قَالَتْ عَائِشَةُ فَلَمَّا دَخَلَ رَسُولُ اللَّهِ ﷺ قُلْتُ يَا رَسُولَ اللَّهِ إِنَّ أَفْلَحَ أَخَا أَبِي الْقُعَيْسِ جَاءَنِي يَسْتَأْذِنُ عَلَىَّ فَكَرِهْتُ أَنْ آذَنَ لَهُ حَتَّى أَسْتَأْذِنَكَ قَالَتْ فَقَالَ النَّبِيُّ ﷺ ائْذَنِي لَهُ قَالَ عُرْوَةُ فَبِذَلِكَ كَانَتْ عَائِشَةُ تَقُولُ حَرِّمُوا مِنَ الرَّضَاعَةِ مَا تُحَرِّمُونَ مِنَ النَّسَبِ