(7) باب الشَّهَادَةِ عَلَى الأَنْسَابِ وَالرَّضَاعِ الْمُسْتَفِيضِ وَالْمَوْتِ الْقَدِيمِ
Narrated Aisha:
Aflah asked the permission to visit me but I did not allow him. He said, "Do you veil yourself before me although I am your uncle?" `Aisha said, "How is that?" Aflah replied, "You were suckled by my brother's wife with my brother's milk." I asked Allah's Messenger (ﷺ) about it, and he said, "Aflah is right, so permit him to visit you."
Reference: Sahih al-Bukhari 2644
In-book reference: Book 52, Hadith 8
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 48, Hadith 812