The Third Commandment states that we are not to use the name of the Lord in vain (Exodus 20:7). To use the Lord’s name in vain is to use it flippantly (i.e., to take it lightly without thinking), profanely (i.e., to treat God whose name is holy with irreverence), or deceitfully (i.e., to be dishonest in invoking the name of God).