Charles Ellicott Commentary Proverbs 26:6

"He that sendeth a message by the hand of a fool Cutteth off [his own] feet, [and] drinketh in damage." — Proverbs 26:6 (ASV)

Cuts off the feet.— He wants his business done, but if he sends a fool to do it, he might as well cut off his messenger’s legs, because the business will not be transacted; indeed, worse than this, he will “drink damage,” i.e., suffer actual harm from the blundering of his emissary.