Volume 5 · Book 57 · Hadith 87
Narrated Anas bin Malik: Allah's Apostle said, " Every nation has an extremely trustworthy man, and the trustworthy man of this (i.e. Muslim) nation is Abu 'Ubaida bin Al-Jarrah."
— Sahih Bukhari, Volume 5, Book 57: Companions of the Prophet, Hadith #87