A'isha radiallahu anho reported that Allah's Messenger peace be upon him was with her and she heard the voice of a person seeking permission to enter the house of Hafsa. A'isha radiallahu anho said:
Allah's Messenger, he is the person who seeks permission to enter your house, whereupon Allah's Messenger peace be upon him said: I think he is so and so (uncle of Hafsa by reason of fosterage). A'isha said: Messenger of Allah, if so and so (her uncle by reason of fosterage) were alive, could he enter my house? Allah's Messenger peace be upon him said: Yes. Fosterage makes unlawful what consanguinity makes unlawful.