Bilal said to Abu Bakr, "If you have bought me for yourself then keep me (for yourself), but if you have bought me for Allah's Sake, then leave me for Allah's Work."
Reference: Sahih al-Bukhari 3755 In-book : Book 62, Hadith 102 USC-MSA web (English) : Vol. 5, Book 57, Hadith 99 (deprecated)
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