Jude 1:9

Verse 9. Yet Michael the archangel, etc. This verse has given more perplexity to expositors than any other part of the epistle; and in fact the difficulties in regard to it have been so great that some have been led to regard the epistle as spurious. The difficulty has arisen from these two circumstances: (1.) Ignorance of the origin of what is said here of Michael the archangel, nothing of this kind being found in the Old Testament; and (2.) the improbability of the story itself, which looks like a mere Jewish fable. Peter in his second epistle, chap.