´It was narrated from 'Abdullah that:` The Messenger of Allah said to Abu 'Ubaidah bin Jarrah: "This is the trustworthy man of this Ummah."
Explanation & Benefits
Maulana Ataullah Sajid
For this reason, he is called "Amin al-Ummah" (the trustworthy of the Ummah).
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 136