It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: The Noble Prophet (peace and blessings be upon him) was sitting with me when I heard the voice of a man who was seeking permission to enter the house of Sayyida Hafsa (may Allah be pleased with her). I said: O Messenger of Allah! This man is seeking permission to enter your house? The Messenger of Allah (peace and blessings be upon him) said: I think he is such-and-such foster uncle of Hafsa. I said: O Messenger of Allah! If my such-and-such foster uncle were alive, could he enter upon me? The Messenger of Allah (peace and blessings be upon him) said: Yes, absolutely, indeed fosterage makes unlawful those relationships which are made unlawful by lineage and birth.