2 Peter 2:22
Of them the proverbs are true: "A dog returns to its vomit," and, "A sow that is washed goes back to her wallowing in the mud."

Exodus 8:15
When Pharaoh saw there was relief, however, he hardened his heart and would not listen to Moses and Aaron, just as the LORD had said.

Proverbs 23:35
"They struck me, but I feel no pain! They beat me, but I did not know it! When can I wake up to search for another drink?"

Proverbs 26:10
Like an archer who wounds at random is he who hires a fool or passer-by.

Proverbs 27:22
Though you grind a fool in a mortar with a pestle along with grain, yet his folly will not depart from him.