'Justify' in the Bible

As to Samaria, as the half of thy sins -- she hath not sinned, And thou dost multiply thine abominations more than they, And dost justify thy sisters by all thy abominations that thou hast done.

So now, bear your disgrace, because you have given your sisters reason to justify their behavior. Because the sins you have committed were more abominable than those of your sisters; they have become more righteous than you. So now, be ashamed and bear the disgrace of making your sisters appear righteous.