II Peter 2:22

But--You need not wonder at the event; for dogs and swine they were before, and dogs and swine they will continue. They "scarcely" (Pe2 2:18) have escaped from their filthy folly, when they again are entangled in it. Then they seduce others who have in like manner "for a little time escaped from them that live in error" (Pe2 2:18). Peter often quoted Proverbs in his First Epistle (Pe1 1:7; Pe1 2:17; Pe1 4:8, Pe1 4:18); another proof that both Epistles come from the same writer. Next: 2 Peter Chapter 3

The apostle, having in the foregoing chapter exhorted them to proceed and advance in the Christian race, now comes to remove, as much as in him lay, what he could not but apprehend would hinder their complying with his exhortation. He therefore gives them fair warning of false teachers, by whom they might be in danger of being seduced. To prevent this, I. He describes these seducers as impious in themselves, and very pernicious to others (Pe2 2:1-3). II. He assures them of the punishment that shall be inflicted on them (Pe2 2:3-6). III. He tells us how contrary the method is which God takes with those who fear him (Pe2 2:7-9). IV. He fills up the rest of the chapter with a further description of those seducers of whom he would have them beware.

2:22 “A dog returns to its vomit”: Dogs were not seen as friendly family pets but as wild and filthy beasts. • “A washed pig returns to the mud”: This proverb might go back to a popular book of sayings called Ahiqar from around 500 BC, which reads, “My son, you have been to me like the pig who went into the hot bath with people of quality, and when it came out of the hot bath, it saw a filthy hole and went down and wallowed in it” (Ahiqar 8:18).