Matthew 5:35-37

Young's Literal Translation

³⁵ nor by the earth, because it is His footstool, nor by Jerusalem, because it is a city of a great king,

³⁶ nor by thy head mayest thou swear, because thou art not able one hair to make white or black;

³⁷ but let your word be, Yes, Yes, No, No, and that which is more than these is of the evil.