Matthew 5:33-36
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33Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths: 34But I say unto you, Swear not at all; neither by heaven; for it is God's throne: 35Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King. 36Neither shalt thou swear by thy head, because thou canst not make one hair white or black.