2 Peter 2:22

New American Bible - revised edition

What is expressed in the true proverb has happened to them, “The dog returns to its own vomit,” and “A bathed sow returns to wallowing in the mire.”

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As dogs return to their vomit, so fools repeat their folly.

If the infection breaks out once more in the house after the stones have been pulled out and the house has been scraped and replastered,

Although Jesus used this figure of speech, they did not realize what he was trying to tell them.