Jude 1:9

9.Yet Michael the archangel. Peter gives this argument shorter, and states generally, that angels, far more excellent than men, dare not bring forward a railing judgment. [2 Peter 2:11.]

But as this history is thought to have been taken from an apocryphal book, it has hence happened that less weight has been attached to this Epistle. But since the Jews at that time had many things from the traditions of the fathers, I see nothing unreasonable in saying that Jude referred to what had already been handed down for many ages. I know indeed that many puerilities had obtained the name of tradition, as at this day the Papists relate as traditions many of the silly dotages of the monks; but this is no reason why they should not have had some historical facts not committed to writing.

It is beyond controversy that Moses was buried by the Lord, that is, that his grave was concealed according to the known purpose of God. And the reason for concealing his grave is evident to all, that is, that the Jews might not bring forth his body to promote superstition. What wonder then is it, when the body of the prophet was hidden by God, Satan should attempt to make it known; and that angels, who are ever ready to serve God, should on the other hand resist him? And doubtless we see that Satan almost in all ages has been endeavoring to make the bodies of God’s saints idols to foolish men. Therefore this Epistle ought not to be suspected on account of this testimony, though it is not found in Scripture.

That Michael is introduced alone as disputing against Satan is not new. We know that myriads of angels are ever ready to render service to God; but he chooses this or that to do his business as he pleases. What Jude relates as having been said by Michael, is found also in the book of Zechariah,

“Let God chide (or check) thee, Satan.”
(Zechariah 3:2.)

And it is a comparison, as they say, between the greater and the less. Michael dared not to speak more severely against Satan (though a reprobate and condemned) than to deliver him to God to be restrained; but those men hesitated not to load with extreme reproaches the powers which God had adorned with peculiar honors.