Solomon
Proverbs 26:6ESV·traditional attribution

Whoever sends a message by the hand of a fool cuts off his own feet and drinks violence.

Matthew Henry Presbyterian @wholebiblehenry

To recommend wisdom to us, and to quicken us to the diligent use of all the means for the getting of wisdom, Solomon here shows that fools are fit for nothing; they are either sottish men, who will never think and design at all, or vicious men, who will never think and design well. 1.

Commenting on Proverbs 26:6-9

John Gill Reformed Baptist @doctorgill

He that sendeth a message by the hand of a fool,.... Who knows not how to deliver it in a proper manner, and is incapable of taking the answer, and reporting it as he should; or unfaithful in it, and brings a bad or false report, as the spies did upon the good land; cutteth off the feet; he may as well cut off his...

Jamieson-Fausset-Brown Reformed @jfbcommentary

A fool fails by folly as surely as if he were maimed. drinketh damage--that is, gets it abundantly (Job 15:16; Job 34:7).