Proverbs 24:28

Be not a witness against thy neighbour, either in judgment or in private conversation, without cause; rashly or falsely, without just and sufficient cause. Deceive not neither thy neighbour, to whom thou hast made a show of friendship, nor the judge, nor any other bearers, with false information. Or this clause forbids flattering him to his face, as the former forbids slandering him behind his back.