Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "Indeed, Mu'adh bin Jabal (may Allah be pleased with him) was an ummah, devoutly obedient to Allah, upright, and he was not one of the polytheists." At this a man said: "O Abu Abd al-Rahman! We see you telling us something you do not know; Allah, the Mighty and Majestic, says 'Indeed, Ibrahim,' and you say: 'Indeed, Mu'adh.'" He said: "These people keep hearing the truth from me, yet they do not accept it. The qanit is the one obedient to Allah, and Mu'adh was like that."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9912