James 5:12
Above all, my brothers, stop swearing, either by heaven or by the earth, or by anything else. Let your "Yes" mean Yes, and your "No," No, so as to keep from falling under condemnation.
Matthew 23:16-22
A curse on you, you blind leaders who say, 'Whoever swears by the sanctuary is not duty-bound, but whoever swears by the gold of the sanctuary is duty-bound.'
Matthew 5:33-37
"Again, you have heard that it was said to the men of old, 'You must not swear falsely, but you must perform your oaths as a religious duty.'
Hebrews 6:16-17
For it is a custom among men to take oath by something greater than themselves, and an oath taken for confirmation settles any dispute among them.
Matthew 26:63-64
But Jesus kept silent. So the high priest said to Him, "I charge you, on your oath, in the name of 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 was to spare you pain that I gave up my visit to Corinth.