Proverbs 20:22 Halakhah

אַל־תֹּאמַ֥ר אֲשַׁלְּמָה־רָ֑ע קַוֵּ֥ה לַֽ֝יהוָ֗ה וְיֹ֣שַֽׁע לָֽךְ׃

Say not thou: ‘I will requite evil’; wait for the LORD, and He will save thee.

Read halakhic rulings (Jewish law) on Proverbs 20:22: and classical halakhic sources.