The Prophet (ﷺ) asked Abu Bakr for `Aisha's hand in marriage. Abu Bakr said "But I am your brother." The Prophet (ﷺ) said, "You are my brother in Allah's religion and His Book, but she (Aisha) is lawful for me to marry."
Reference: Sahih al-Bukhari 5081 In-book : Book 67, Hadith 19 USC-MSA web (English) : Vol. 7, Book 62, Hadith 18 (deprecated)
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