The Messenger of Allah said to the people of Najran: "I will send you a trustworthy man with you, who is indeed trustworthy." The people craned their necks to see, and he sent Abu 'Ubaidah bin Jarrah.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لأَهْلِ نَجْرَانَ سَأَبْعَثُ مَعَكُمْ رَجُلاً أَمِينًا حَقَّ أَمِينٍ قَالَ فَتَشَوَّفَ لَهَا النَّاسُ فَبَعَثَ أَبَا عُبَيْدَةَ بْنَ الْجَرَّاحِ  

The Messenger of Allah said to Abu 'Ubaidah bin Jarrah: "This is the trustworthy man of this Ummah."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لأَبِي عُبَيْدَةَ بْنِ الْجَرَّاحِ هَذَا أَمِينُ هَذِهِ الأُمَّةِ