Aflah, the brother of Abi Al-Qu`ais, 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 (ﷺ) 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 (ﷺ) entered upon
me, and I said to him, "O Allah's Messenger (ﷺ)! Aflah, 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 Messenger (ﷺ)! 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."
Sahih al-Bukhari Book 65, Hadith 318