Sahih Muslim 2419
Sahih Muslim · Book 44: The Book of the Merits of the Companions · The Virtues Of Abu 'Ubaidah Bin Al-Jarrah (RA)
Anas reported that the people of Yemen came to Allah's Messenger (ﷺ) and said:
حَدَّثَنِي عَمْرٌو النَّاقِدُ ، حَدَّثَنَا عَفَّانُ ، حَدَّثَنَا حَمَّادٌ، - وَهُوَ ابْنُ سَلَمَةَ - عَنْ ثَابِتٍ ، عَنْ أَنَسٍ ، أَنَّ أَهْلَ الْيَمَنِ، قَدِمُوا عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالُوا ابْعَثْ مَعَنَا رَجُلاً يُعَلِّمْنَا السُّنَّةَ وَالإِسْلاَمَ . قَالَ فَأَخَذَ بِيَدِ أَبِي عُبَيْدَةَ فَقَالَ " هَذَا أَمِينُ هَذِهِ الأُمَّةِ " .
Send with us a person who should teach us Sunnah and al-Islam, whereupon he (the Holy Prophet) caught hold of the hand of Ubaida and said: He is a man of trust of this Umma.