Joseph Benson's Commentary of the Old and New Testaments - Jude 1:9
Judges 1:9. Yet Michael, &c. It does not appear whether St. Jude learned this by any revelation, or from an ancient tradition. It suffices that these things were not only true, but acknowledged to be so by them to whom he wrote. Michael is mentioned Daniel 10:13; Daniel 10:21; Daniel 12:1, as standing up in defence of Daniel’s people. “Because the book of Daniel is the first sacred writing in which proper names are given to particular angels, some have fancied that, during the... read more
Albert Barnes' Notes on the Whole Bible - Jude 1:9
Yet Michael the archangel ... - 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: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... read more