Proverbs 25:18-20

Complete Jewish Bible

¹⁸ Like a club, a sword or a sharp arrow
    is a person who gives false testimony against a neighbor.

¹⁹ Relying on an untrustworthy person in a time of trouble
    is like [relying on] a broken tooth or an unsteady leg.

²⁰ Like removing clothes on a chilly day or like vinegar on soda
    is someone who sings songs to a heavy heart.