(Matt. 5:33-37) Again you have heard that it was said to them of old: 'Thou shalt not forswear thyself, but thou shalt perform thy oaths to the Lord' (Exod. 20:7; Lev. 19:12; Deut. 5:11). But I say to you not to swear at all, neither by heaven, for it is the throne of God; nor by the earth, for it is his footstool; nor by Jerusalem, for it is the city of the great king (Ps. 47:3); neither shalt thou swear by thy head, because thou canst not make one hair white or black. But let your speech be: 'Yea, yea; No, no'; and that which is over and above these, is of evil.