Leviticus 19:12
And you shall not swear by my name falsely, neither shall you profane the name of your God: I am the LORD.
Torrey's Topical Textbook—AKJV

Numbers 30:2
If a man vow a vow to the LORD, or swear an oath to bind his soul with a bond; he shall not break his word, he shall do according to all that proceeds out of his mouth.
Torrey's Topical Textbook—AKJV

Matthew 5:33
Again, you have heard that it has been said by them of old time, You shall not forswear yourself, but shall perform to the Lord your oaths:
Torrey's Topical Textbook—AKJV