<P> Members of The Church of Jesus Christ of Latter - day Saints believe in this commandment as written in Exodus 20 . This commandment has been repeated in the LDS Scriptures such as the Book of Mormon and in Doctrine and Covenants . </P> <P> 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 . </P> <P> Keep yourselves from evil to take the name of the Lord in vain, for I am the Lord your God, even the God of your fathers, the God of Abraham and of Isaac and of Jacob . </P> <P> And again, the Lord God hath commanded that men should not murder; that they should not lie; that they should not steal; that they should not take the name of the Lord their God in vain; that they should not envy; that they should not have malice; that they should not contend one with another; that they should not commit whoredoms; and that they should do none of these things; for whoso doeth them shall perish . </P>

Don't mention god's name in vain