Proverbs 10:18 in the King James Version
He that hideth hatred with lying lips, and he that uttereth a slander, is a fool.
Context
17 He is in the way of life who heeds correction, but he who forsakes reproof leads others astray.
18 He who hides hatred has lying lips. He who utters a slander is a fool.
19 In the multitude of words there is no lack of disobedience, but he who restrains his lips does wisely.