You unleash your mouth for evil and harness your tongue to deceit.
PSALM 50 There have always been hypocrites in the Church, men who have placed religion in a mere observance of outward ceremonies, and among the Jews there were many who turned their attention entirely to the figures of the Law, without regarding the truth which was represented under them. They conceived that nothing more was demanded of them but their sacrifices and other rites.
Commenting on Psalm 50:1-23
Here the Lord turns to the manifestly wicked among his people; and such there were even in the highest places of his sanctuary. If moral formalists had been rebuked, how much more these immoral pretenders to fellowship with heaven? If the lack of heart spoiled the worship of the more decent and virtuous, how much more would violations of the law, committed with a high...
Commenting on Psalm 50:16
Thou givest thy mouth to evil. Sins against the ninth commandment are here mentioned. The man who surrenders himself to the habit of slander is a vile hypocrite if he associates himself with the people of God. A man's health is readily judged by his tongue. A foul mouth, a foul heart.