Sahih Bukhari
Accepting Information Given by a Truthful Person
Volume: 009 / Book Number: 091 / Hadith Number: 360
Narrated Hudhaifa:
The Prophet said to the people of Najran, "I will send to you an honest person who is really trustworthy." The Companion, of the Prophet each desired to be that person, but the Prophet sent Abu 'Ubaida.