Proverbs 24:28-29

Be not witness against thy neighbour Either in judgment or in private conversation; without cause Rashly or falsely, without just and sufficient cause; and deceive not with thy lips Neither thy neighbour, nor the judge, nor any other hearers, with false information. Or, this clause forbids flattering him to his face, as the former forbids slandering him behind his back. Say not Within thyself: give not way to any such thoughts or passions; I will render, &c., according to his works I will repay him all his calumnies and injuries.