Matthew 5:33-37

Again, you have heard that it was said to the people long ago, ‘Do not break your oath, but fulfill to the Lord the vows you have made.’ ³⁴ But I tell you, do not swear an oath at all: either by heaven, for it is God’s throne; ³⁵ or by the earth, for it is his footstool; or by Jerusalem, for it is the city of the Great King. ³⁶ And do not swear by your head, for you cannot make even one hair white or black. ³⁷ All you need to say is simply ‘Yes’ or ‘No’; anything beyond this comes from the evil one.