Jude 1:10-11

But these Without any shame; speak evil of those things which they know not Namely, the things of God; of whose nature and excellence, truth and importance, they are entirely ignorant. See on 1 Corinthians 2:14. But what they know naturally as brute beasts By instinct, as animals void of reason; in those things they corrupt themselves They make them occasions of sin: or, they are corrupted by the gross and scandalous abuse of them, to the dishonour of God, and their own infamy and destruction. Thus the apostle signifies that, notwithstanding their high pretensions to knowledge, they had no knowledge even concerning the use of their own bodies, but what they derived from natural instinct as brute animals; and that, instead of using that knowledge rightly, they thereby destroyed both their souls and bodies. Thus, in this passage, he condemned the lascivious practices of the Nicolaitans, and of all the ungodly teachers, who defended the promiscuous use of women, and confuted the argument taken from natural appetite, by which they vindicated their common whoredoms. Wo unto them Of all the apostles, Jude alone, and that in this single passage, denounces a wo. St. Peter, to the same effect, pronounces them cursed children. Macknight, who renders the clause, wo is to them, considers it as only a declaration of the misery which was to come on them: in which sense only the phrase is used by our Lord, Matthew 24:19; Wo unto them that are with child, &c., for certainly this was no wish of punishment, since to be with child, and to give suck in those days, was no crime. But it was a declaration of the misery which was coming on persons in that helpless condition. For they have gone in the way of Cain The murderer; and ran greedily Greek, εξεχυθησαν, have been poured out, like a torrent without banks; after the error of Balaam The covetous false prophet, being strongly actuated, like him, by a passion for riches, and therefore drawing money from their disciples by allowing them to indulge their lusts without restraint. See on 2 Peter 2:15. And perished in the gainsaying of Core Having opposed God's messengers, as Korah did, like him and his company, vengeance will overtake them, as it did him. Here, as in many passages of Scripture, a thing is said to have happened which was only to happen. This manner of speaking was used to show the absolute certainty of the thing spoken of. The gainsaying, here mentioned, implies rebellion; for when princes and magistrates are contradicted, it is rebellion. By declaring that the ungodly teachers would perish in the rebellion of Korah, Jude insinuated that these men, by opposing the apostles of Christ, were guilty of a rebellion similar to that of Korah and his companions, who opposed Moses and Aaron, on pretence that they were no more commissioned by God, the one to be a prince, the other a priest, than the rest of the congregation, who, they said, were all holy, Numbers 16:3; Numbers 16:13. By comparing these false and wicked teachers to Cain, Balaam, and Korah, Jude has represented them as guilty of murder, covetousness, and ambition.