(117) باب مَا يَحِلُّ مِنَ الدُّخُولِ وَالنَّظَرِ إِلَى النِّسَاءِ فِي الرَّضَاعِ
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 Messenger (ﷺ)! I have been suckled by a woman and not by a man." Allah's Messenger (ﷺ) 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 corresponding foster suckling relations.
Reference: Sahih al-Bukhari 5239
In-book reference: Book 67, Hadith 172
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 166