Catechisma

Q53. What is the third commandment?

The third commandment is: "You shall not take the name of the Lord your God in vain, for the Lord will not hold him guiltless who takes his name in vain."

Scripture Proofs — King James Version

1

Exodus 20:7

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.