Proverbs 26:11

⁹ Like a thorn that falls into the hand of a drunkard is a proverb in the mouth of a fool.

¹⁰ Like an archer who wounds at random is he who hires a fool or passerby.

As a dog returns to its vomit, so a fool repeats his folly.

¹² Do you see a man who is wise in his own eyes? There is more hope for a fool than for him.

¹³ The slacker says, “A lion is in the road! A fierce lion roams the public square!”

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: As a dog returns to its vomit, so a fool repeats his folly.
KJV: As a dog returneth to his vomit, so a fool returneth to his folly.
WEB: As a dog that returns to his vomit, so is a fool who repeats his folly.
ASV: As a dog that returneth to his vomit, [So is] a fool that repeateth his folly.
DARBY: As a dog turneth back to its vomit, [so] a fool repeateth his folly.
BLB: Like a dog returning to its vomit [is] a fool repeating his folly.

ÅB: Lik hunden som vender tilbake til sitt eget spy, er en dåre som kommer igjen med sin dårskap.
OTB: Som en hund vender tilbake til sitt spy, slik gjentar en dåre sin dårskap.
B1930: Lik hunden som vender tilbake til sitt eget spy, er en dåre som kommer igjen med sin dårskap.

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.”
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Matthew 12:45
Then it goes and brings with it seven other spirits more wicked than itself, and they go in and dwell there; and the final plight of that man is worse than the first. So will it be with this wicked generation.”
Read in context
Exodus 8:15
When Pharaoh saw that there was relief, however, he hardened his heart and would not listen to Moses and Aaron, just as the LORD had said.
Read in context