Matthew 5:33-37

33 Again, ye have heard that it was said to the ancients, Thou shalt not perjure thyself, but shalt perform unto the Lord thine oaths;

34 but I say unto you, Swear not at all; neither by the heaven, for it is God’s throne,

35 nor by the earth, for it is his footstool, neither by Jerusalem, for 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 communication be, Yes, yes; No, no; for whatsoever is more than this comes of evil.