Matthew 5:33-35

33Again, ye have heard that it was said to 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 the heaven, for it is the throne of God;

35nor by the earth, for it is the footstool of his feet; nor by Jerusalem, for it is the city of the great King.