Matthew 5:33-37

33 Again, ye have heard that it has been said to the ancients, Thou shalt not forswear thyself, but shalt render to the Lord what thou hast sworn.
34 But *I* say unto you, Do not swear at all; neither by the heaven, because it is [the] throne of God;
35 nor by the earth, because it is [the] footstool of his feet; nor by Jerusalem, because it is [the] city of the great King.
36 Neither shalt thou swear by thy head, because thou canst not make one hair white or black.
37 But let your word be Yea, yea; Nay, nay; but what is more than these is from evil.

Footnotes 1

The Darby Translation is in the public domain.