שֵׁ֣ן רֹ֭עָה וְרֶ֣גֶל מוּעָ֑דֶת מִבְטָ֥ח בּ֝וֹגֵ֗ד בְּי֣וֹם צָרָֽה׃
Confidence in an unfaithful man in time of trouble Is like a broken tooth, and a foot out of joint.
Read halakhic rulings (Jewish law) on Proverbs 25:19: and classical halakhic sources.