Sahih Al Bukhari – Book of Wedlock, Marriage (Nikaah)

Volumn 007, Book 062, Hadith Number 148.
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Narated By 'Aisha RA : Allah's Apostle PBUH said, "O followers of Muhammad! There is none, who has a greater sense of Ghira (self-respect) than Allah, so He has forbidden that His slave commits illegal sexual intercourse or His slave girl commits illegal sexual intercourse. O followers of Muhammad! If you but knew what I know, you would laugh less and weep more!"