The Book of Marriage (Kitab Al-Nikah)
Muslim :: Book 8 : Hadith 3401
'A'isha (Allah be pleased with her) reported: My foster uncle came to me and sought permission (to enter the house), but I refused him permission until I had solicited the opinion of Allah's Messenger (may peace be upon him). When Allah's Messenger (may peace be upon him) came, I said to him: My foster-uncle sought my permission to (enter the house), but I did not permit him, whereupon Allah's Messenger (may peace be upon him) said: You better admit your uncle (into the house). I ('A'isha) said: It was the woman who suckled me and not the man. (But he) said: He is your uncle, admit him.
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