"I said: 'O Messenger of Allah, there is a man asking permission to enter your house.' The Messenger of Allah said: 'I think it is so-and-so the paternal uncle of Hafsah through breast-feeding.' 'Aishah said: If so-and-so (her own paternal uncle through breast-feeding) were alive, would he be allowed to enter upon me?' The Messenger of Allah said: 'What becomes unlawful (for marriage) through breast-feeding is that which becomes unlawful through birth.'" (Using translation from Nasāʾī 3313)   

أَنَّهَا كَانَتْ مَعَ النَّبِيِّ ﷺ فِي بَيْتِ حَفْصَةَ فَسَمِعَتْ صَوْتَ إِنْسَانٍ قَالَتْ قُلْتُ يَا رَسُولَ اللَّهِ سَمِعْتُ صَوْتَ إِنْسَانٍ فِي بَيْتِكَ فَقَالَ رَسُولُ اللَّهِ ﷺ «أُرَاهُ فُلَانًا لِعَمِّ حَفْصَةَ مِنَ الرَّضَاعَةِ» قَالَتْ عَائِشَةُ يَا رَسُولَ اللَّهِ وَلَوْ كَانَ فُلَانٌ حَيًّا لِعَمِّهَا مِنَ الرَّضَاعَةِ دَخَلَ عَلَيَّ فَقَالَ رَسُولُ اللَّهِ ﷺ «نَعَمْ يَحْرُمُ مِنَ الرَّضَاعَةِ مَا يَحْرُمُ مِنَ الْوِلَادَةِ»  

[Machine] Her uncle, the brother of her father Al-Quais, came to seek permission from her after the veiling of women had been commanded. She refused to give him permission until the Messenger of Allah ﷺ came and sought permission for him. When the Prophet ﷺ came, she mentioned this to him, and she said, "My uncle, the brother of my father, came, and I kept repeating it until I sought your permission." He said, "Isn't he your uncle?" She said, "He breastfed me, but I was not breastfed by a man." He said, "He is your uncle, so let him enter upon you." Aisha used to say that what is forbidden by birth is also forbidden by breastfeeding.  

أَنَّ عَمَّهَا أَخَا أَبِي الْقُعَيْسِ جَاءَ يَسْتَأْذِنُ عَلَيْهَا بَعْدَمَا ضُرِبَ الْحِجَابُ فَأَبَتْ أَنْ تَأْذَنَ لَهُ حَتَّى يَأْتِيَ رَسُولُ اللَّهِ ﷺ فَأَسْتَأْذِنَهُ فَلَمَّا جَاءَ النَّبِيُّ ﷺ ذَكَرَتْ ذَلِكَ لَهُ فَقَالَتْ جَاءَ عَمِّي أَخُو أَبِي الْقُعَيْسِ فَرَدَدْتُهُ حَتَّى أَسْتَأْذِنَكَ قَالَ «أَوَ لَيْسَ بِعَمِّكِ؟» قَالَتْ إِنَّمَا أَرْضَعَتْنِي الْمَرْأَةُ وَلَمْ يُرْضِعْنِي الرَّجُلُ فَقَالَ «إِنَّهُ عَمُّكِ فَلْيَلِجْ عَلَيْكِ» فَقََالَتْ وَكَانَتْ عَائِشَةُ تَقُولُ يَحْرُمُ مِنَ الرَّضَاعَةِ مَا يَحْرُمُ مِنَ الْوِلَادَةِ  

"What becomes unlawful through breastfeeding is that which becomes unlawful through birth." (Using translation from Muslim 1444b)  

عَنِ النَّبِيِّ ﷺ قَالَ «يَحْرُمُ مِنَ الرَّضَاعَةِ مَا يَحْرُمُ مِنَ الْوِلَادَةِ»  

[Machine] From the Prophet ﷺ like him.  

عَنِ النَّبِيِّ ﷺ مِثْلَهُ