Bukhari :: Book 3 :: Volume 36 :: Hadith 465
(the wife of the Prophet) Allah's Apostle and Abu Bakr hired a man from the tribe of Bani-Ad-Dil as an expert guide who was a pagan (follower of the religion of the pagans of Quraish). The Prophet and Abu Bakr gave him their two riding camels and took a promise from him to bring their riding camels in the morning of the third day to the Cave of Thaur.
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