Matthew 5:33-37 - The Sermon On The Mount: Taking Oaths
33 "Again, ye have heard how it was said to them of old time, 'Thou shalt not forswear thyself, but shalt perform thine oath to God': 34 But I say unto you, Swear not at all; neither by heaven; for it is God's seat: 35 nor yet by the earth; for it is His footstool: neither by Jerusalem; for it is the city of that great King: 36 neither shalt thou swear by thy head, because thou canst not make one white hair or black: 37 But your communication shall be, 'Yea, Yea; Nay, nay': for whatsoever is more than that cometh of evil.