‘Aa’ishah narrated: “Aflah came to visit me after the verse commanding women to observe Hijab was revealed. He was the brother of Abu Al-Qu’ays whose wife had breastfed me. Aflah sought permission (to enter) but I said: ‘By Allah, I would not permit Aflah to enter unless I have solicited the opinion of the Messenger of Allah, sallallaahu ‘alayhi wa sallam, for Abu Al-Qu’ays was not the one who suckled me, rather it was his wife who did.’”
‘Aa’ishah continued,
“When the Messenger of Allah, sallallaahu ‘alayhi wa sallam, entered, I said: ‘O the Messenger of Allah, Aflah is the brother of Abu Al-Qu’ays; he came to me to seek my permission for entering (my residence).I did not like the idea of granting him permission until I had solicited your opinion. Thereupon the Messenger of Allah, sallallaahu ‘alayhi wa sallam, said: “What stopped you from granting him permission?” I said: ‘Abu Al-Qu’ays was not the one suckled me, rather it was his wife who did’. Thereupon the Messenger of Allah, sallallaahu ‘alayhi wa sallam, said: “Grant him permission as he is your uncle [the brother of her foster-father is considered her uncle].”