'Swear an Oath' in the Bible

"Again, you have heard that it was told those who lived long ago, "You must not swear an oath falsely,' but, "You must fulfill your oaths to the Lord.'

Above all, my brothers, never swear an oath, either by heaven or by earth or by anything else; let your "yes" be a plain "yes," your "no" a plain "no," lest you incur judgment.