Qais b. Abu Hazim told that Bilal said to Abu Bakr, "If you bought me only for your own sake keep me, but if you bought me only for God's sake let me go and undertake God's work." Bukhari transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب المناقب / 6260
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه البخاري (3755)»