Cross reference
Proverbs 26:11
11 As a dog hath returned to its vomit, A fool is repeating his folly.
Exodus 8:15
15 And Pharaoh seeth that there hath been a respite, and he hath hardened his heart, and hath not hearkened unto them, as Jehovah hath spoken.
2 Peter 2:22
22 and happened to them hath that of the true similitude; `A dog did turn back upon his own vomit,' and, `A sow having bathed herself -- to rolling in mire.'
Matthew 12:45
45 then doth it go, and take with itself seven other spirits more evil than itself, and having gone in they dwell there, and the last of that man doth become worse than the first; so shall it be also to this evil generation.'