Deuteronomy 5:11
Do not take the name of Jehovah your God in vain. Jehovah will not leave him unpunished who takes his name in vain.
Leviticus 19:12
Do not swear falsely by my name, so as to profane the name of your God. I am Jehovah.
Exodus 20:7
Never use the name of Jehovah your God in a false and evil way. Jehovah will make sure that anyone who is false, evil, careless and vain with his name will be punished.
Deuteronomy 6:13
You must respect Jehovah your God. Serve him and swear by his name!
Matthew 5:33-34
You were also told that you should keep a promise (oath). Always keep your promises (vows) to Jehovah.
Psalm 139:20
For they speak against you wickedly. Your enemies take your name in vain.
Jeremiah 4:2
if you take the oath, as Jehovah lives in an honest, fair, and right way, then the nations will be blessed, and in him they will glory.
James 5:12
Above all things, my brothers do not swear by heaven, or by earth, or by any other oath. Let your Yes be Yes and your No be No. That way you will not fall under judgment.