"Thou shalt not take the name of the Lord thy God in vain; for the Lord will not hold him guiltless that taketh his name in vain." [Exodus 20:7]
The verse quoted above is known as 'The Third Commandment.' It deals with something far more serious than just a filthy mouth. This commandment is talking about the misuse and profane use of God's Holy Name. Dr. McDonald doesn't mince any words. He goes straight to the point. A great witnessing tool for our Lord's Holy Name.