Volume 7, Book 62, Number 166:
Narrated ‘Aisha:
My foster uncle came and asked permission (to enter) but I refused to admit him till I asked Allah’s
Apostle about that. He said, “He is your uncle, so allow him to come in.” I said, “O Allah’s Apostle! I
have been suckled by a woman and not by a man.” Allah’s Apostle said, “He is your uncle, so let him
enter upon you.” And that happened after the order of Al-Hijab (compulsory veiling) was revealed.
All things which become unlawful because of blood relations are unlawful because of the corres –
ponding foster suckling relations.