It was narrated from 'Aishah that her paternal uncle through breast-feeding, whose name was Aflah, asked permission to meet her, and she observed Hijab before him. The Messenger of Allah was told about that and he said:
"Do not observe Hijab before him, for what becomes unlawful (for marriage) through breast-feeding is that which becomes unlawful through lineage."
Reference: Sunan an-Nasa'i 3301 In-book : Book 26, Hadith 106 English translation : Vol. 4, Book 26, Hadith 3303
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