2 Peter 2:22

But the saying of the true proverb has happened to them: "The dog is returned to his own vomit; and the washed hog, to its wallowing in the mire."

Treasury of Scripture Knowledge

Summary

Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.

Bible References

That

2 Peter 2:22
But the saying of the true proverb has happened to them: "The dog is returned to his own vomit; and the washed hog, to its wallowing in the mire."