You shall not take the name of the LORD your God in vain; for the LORD will not hold him guiltless that takes his name in vain.
All Commentaries on Exodus 20:7 Go To Exodus 20
Augustine of Hippo
AD 430
You are told “Do not take the name of the Lord your God in vain”; do not regard Christ as a creature because for your sake he put on the creature. And you, you despise him who is equal to the Father and one with the Father.