Proverbs 26:9-11

Amplified Bible

⁹ 
Like a thorn that goes [without being felt] into the hand of a drunken man,
So is a proverb in the mouth of a fool [who remains unaffected by its wisdom].
¹⁰ 
Like a [careless] archer who [shoots arrows wildly and] wounds everyone,
So is he who hires a fool or those who [by chance just] pass by.
¹¹ 
Like a dog that returns to his vomit
Is a fool who repeats his foolishness.