Exerama appears once, in 2 Peter 2:22, quoting Proverbs 26:11: 'The dog returns to its own vomit.' Peter uses this visceral image to describe false teachers who know the way of righteousness but turn back to the corruption they had escaped. The proverb was well-known in ancient culture, used by both Jewish and Greek writers to describe shameful reversal.
The exerama proverb is one of the Bible's most sobering warnings about apostasy. Peter is not describing ordinary backsliding but a deliberate, knowing return to what was rejected. The theology here connects to Hebrews 6:4-6 and 10:26-29: those who have been enlightened and then deliberately turned away face a severe reckoning. The pastoral implication is clear: perseverance is evidence of genuine salvation. The dog-to-vomit return is a sign of a nature unchanged, not a nature redeemed.