Jeremiah 7:28

But thou shalt say unto them, This is a nation that obeyeth not the voice of the Lord, their God, being therefore classed with the Gentile nations, nor receiveth correction, hardened to the point that all rebukes make no impression upon them; truth is perished, all reliability, all fidelity is lost, and is cut off from their mouth. There is a fine bit of sarcasm in this phrase, for the Jews confessed the Lord with their mouths only, and not with their hearts. The use of God's name for the purpose of mouth-worship only is a flagrant offense against the Second Commandment and is bound to bring down the wrath of God upon the offenders.