2 Peter 2:22

It has happened to them according to the true proverb, "A dog turns back to its own vomit," and, "A sow, after having washed, returns to wallowing in the mire."

Treasury of Scripture Knowledge

Summary

But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.

Bible References

General references

Matthew 7:27
and the rain descended, the floods came, and the winds blew and beat against that house, and it fell. And great was its fall."
Luke 14:30
saying, 'This man began to build, and was not able to finish.'
Luke 17:32
Remember Lot's wife.
1 Timothy 5:15
For some have already turned aside to follow Satan.