The Messenger of Allah ﷺ said, "What a fine man is Abu Bakr. What a fine man is Umar. What a fine man is Abu Ubayda bin Jarra. What a fine man is Usayd bin Hudayr. What a fine man is Thabit bin Qays bin Shammas. What a fine man is Muaz bin Jabal. What a fine man is Muaz bin Amr bin Jamuh."
وإن رسول الله ﷺ قال نعم الرجل أبو بكر نعم الرجل عمر نعم الرجل أبو عبيدة بن الجراح نعم الرجل أسيد بن حضير نعم الرجل ثابت بن قيس بن شماس نعم الرجل معاذ بن جبل نعم الرجل معاذ بن عمرو بن الجموح
Its isnad is sahih. Bukhari related it in Adab al-Mufrad, p. 123, no. 338, and Tirmidhi, 5/666, no. 3795, in the chapter on virtues, the virtues of Muaz. Ibn Abu Shayba also related it, 12/12, no. 11993, in the chapter on virtues, what has been mentioned about Abu Bakr.