Narrated `Amra bint `Abdur-Rahman: `Aisha, the wife of the Prophet told her that once Allah's Apostle was with her and she heard somebody asking permission to enter Hafsa's house. She said, O Allah's Apostle! This man is asking permission to enter your house. Allah's Apostle replied, I think he is so-and-so (meaning the foster uncle of Hafsa). What is rendered illegal because of blood relations, is also rendered illegal because of the corresponding foster-relations.