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tirmidhi:3796Maḥmūd b. Ghaylān > Wakīʿ > Sufyān > Abū Isḥāq > Ṣilah b. Zufar > Ḥudhayfah b. al-Yamān > Jāʾ

that Al-'Aqib and As-Sayyid (two of the leaders of the Christians of Najran) came to the Prophet ﷺ and said: "Send with us your trustworthy one." He said: "I shall send with you a trustworthy one who is truly a trustworthy one." So the people desired that, and he sent Abu 'Ubaidah, may Allah be pleased with him.  

الترمذي:٣٧٩٦حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ قَالَ حَدَّثَنَا وَكِيعٌ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ أَبِي إِسْحَاقَ عَنْ صِلَةَ بْنِ زُفَرَ عَنْ حُذَيْفَةَ بْنِ الْيَمَانِ قَالَ

جَاءَ الْعَاقِبُ وَالسَّيِّدُ إِلَى النَّبِيِّ ﷺ فَقَالاَ ابْعَثْ مَعَنَا أَمِينًا فَقَالَ فَإِنِّي سَأَبْعَثُ مَعَكُمْ أَمِينًا حَقَّ أَمِينٍ فَأَشْرَفَ لَهَا النَّاسُ فَبَعَثَ أَبَا عُبَيْدَةَ بْنَ الْجَرَّاحِ ؓ قَالَ وَكَانَ أَبُو إِسْحَاقَ إِذَا حَدَّثَ بِهَذَا الْحَدِيثِ عَنْ صِلَةَ قَالَ سَمِعْتُهُ مُنْذُ سِتِّينَ سَنَةً هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ أَخْبَرَنَا سَلْمُ بْنُ قُتَيْبَةَ وَأَبُو دَاوُدَ عَنْ شُعْبَةَ عَنْ أَبِي إِسْحَاقَ قَالَ قَالَ حُذَيْفَةُ قَلْبُ صِلَةَ بْنِ زُفَرَ مِنْ ذَهَبٍ وَقَدْ رُوِيَ عَنْ عُمَرَ وَأَنَسٍ عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ لِكُلِّ أُمَّةٍ أَمِينٌ وَأَمِينُ هَذِهِ الأُمَّةِ أَبُو عُبَيْدَةَ بْنُ الْجَرَّاحِ