Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)

Bukhari :: Book 5 :: Volume 59 :: Hadith 664

Narrated Hudhaifa:

The people of Najran came to the Prophet and said, "Send an honest man to us." The Prophet said, "I will send to you an honest man who is really trustworthy." Everyone of the (Muslim) people hoped to be that one. The Prophet then sent Abu Ubaida bin Al-Jarrah.