2 Peter 2:22

In their case it has happened according to the true proverb, The dog returns again to his own vomit, and The sow, after washing, to her 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, and the floods came, and the winds blew, and beat upon that house, and it fell, and great was the fall of it."
Luke 14:30
"'This fellow began to build and could not finish.'
Luke 17:32
"Remember Lot's wife!
1 Timothy 5:15
For already some widows have gone astray after Satan.