עִקֶּשׁ־לֵ֭ב לֹ֣א יִמְצָא־ט֑וֹב וְנֶהְפָּ֥ךְ בִּ֝לְשׁוֹנ֗וֹ יִפּ֥וֹל בְּרָעָֽה׃
He that hath a forward heart findeth no good; And he that hath a perverse tongue falleth into evil.
Read halakhic rulings (Jewish law) on Proverbs 17:20: and classical halakhic sources.