22 It is happened unto them according to the true proverb, "The dog is turned to his vomit again, and the sow that was washed, is returned to her wallowing in the mire."
2 Peter 2:22 Cross References - MSTC
Proverbs 26:11
11 Like as the dog turneth again to his vomit, even so a fool beginneth his foolishness again afresh.