Ayesha said, "Aflah, the brother of Abu Quays, sought permission to enter upon me after the verse of hijab had been revealed. I said, 'By Allah, I will not grant him permission until I ask the Messenger of Allah ﷺ, for it was not the brother of Abu Quays who nursed me, but rather the wife of Abu Quays who nursed me.'The Messenger of Allah ﷺ then came in to me, and I said, 'Messenger of Allah, the man himself did not nurse me, but his wife did.'He replied, 'Grant him permission, for he is your uncle. May your right hand be dusty.'"Urwa said, "It was for this reason that Ayesha used to say, 'Consider forbidden through breastfeeding what is forbidden through lineage.'"
إن أفلح أخا أبي القعيس استأذن علي بعدما نزل الحجاب، فقلت: والله لا آذن له حتى أستأذن رسول الله ﷺ فإن أخا أبي القعيس ليس هو أرضعني، ولكن أرضعتني امرأة أبي القعيس، فدخل علي رسول الله ﷺ فقلت: يا رسول الله، إن الرجل ليس هو أرضعني، ولكن أرضعتني امرأته؟ قال: ائذني له، فإنه عمك تربت يمينك. قال عروة: فبذلك كانت عائشة، تقول: حرموا من الرضاعة ما يحرم من النسب.
Bukhari narrated it in the Book of Manners (6156), and Muslim in the Book of Suckling (1444), both through the route of Zuhri, from Urwa, from Ayesha, and he mentioned it. The wording is Bukhari's. Malik also narrated it in the Book of Suckling (3) from Zuhri with similar wording, but without "May your right hand be in dust."