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 ؓ