James 5:12
Above all, my brothers, do not swear an oath, either by heaven or by the earth, or by anything else; let your "Yes" be a plain Yes, and your "No" a plain No, or you will fall under condemnation.
Matthew 23:16-22
Alas for you, you blind guides, who say, 'If anyone swears by the sanctuary, it does not matter, but if anyone swears by the gold of the sanctuary, it is binding.'
Matthew 5:33-37
"Again, you have heard that the men of old were told, 'You shall not swear falsely, but you must fulfil your oaths to the Lord.'
Hebrews 6:16-17
For men make oath by something greater than themselves, and they accept an oath as settling finally any disagreement they may have.
Matthew 26:63-64
But Jesus was silent. And the high priest said to him, "I charge you, on your oath, by the living God, tell us whether you are the Christ, the son of God."
2 Corinthians 1:23
But upon my soul I call God to witness that it is simply to spare you that I have stayed away from Corinth.