It was narrated from Hudhaifah that: The Messenger of Allah said to the people of Najran: I will send you a trustworthy man with you, who is indeed trustworthy. The people craned their necks to see, and he sent Abu 'Ubaidah bin Jarrah.
It was narrated from 'Abdullah that: The Messenger of Allah said to Abu 'Ubaidah bin Jarrah: This is the trustworthy man of this Ummah.