Exodus 20:7 in the King James Version
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.
Context
6 and showing loving kindness to thousands of those who love me and keep my commandments.
7 “You shall not misuse the name of the LORD your God, for the LORD will not hold him guiltless who misuses his name.
8 “Remember the Sabbath day, to keep it holy.