John Gill Commentary Proverbs 20:22

"Say not thou, I will recompense evil: Wait for Jehovah, and he will save thee." — Proverbs 20:22 (ASV)

Say not thou, I will recompense evil With evil; do an injury to one that has done one to you; private revenge is not to be taken, but should be left to God, to whom vengeance belongs, (Deuteronomy 32:35Deuteronomy 32:41) ; [but] wait on the Lord, and he shall save thee ; commit thyself and cause to God; leave it with him to avenge your wrongs; wait upon him in the way of your duty, and wait his own time to do thee justice; he will at the proper season, and in his own way, save thee from thine enemy, and make a righteous retribution to him.