Messenger of Allah ﷺ said, " Every nation has an extremely trustworthy man, and the trustworthy man of this (i.e. Muslim) nation is Abu 'Ubaida bin Al-Jarrah."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنَّ لِكُلِّ أُمَّةٍ أَمِينًا وَإِنَّ أَمِينَنَا أَيَّتُهَا الأُمَّةُ أَبُو عُبَيْدَةَ بْنُ الْجَرَّاحِ  

The Prophet ﷺ said to the people of Nijran, "I will send you the most trustworthy man." (Every one of) the companions of the Prophet ﷺ was looking forward (to be that person). He then sent Abu 'Ubaida.  

قَالَ النَّبِيُّ ﷺ لأَهْلِ نَجْرَانَ لأَبْعَثَنَّ يَعْنِي عَلَيْكُمْ يَعْنِي أَمِينًا حَقَّ أَمِينٍ فَأَشْرَفَ أَصْحَابُهُ فَبَعَثَ أَبَا عُبَيْدَةَ ؓ