 to those of old, you shall not swear falsely, but shall perform your oath to the Lord. But I say to you, do not swear at all, neither by heaven, for it is God's throne, nor by earth, for it is his footstool, nor by Jerusalem, for it is the city of the king, the great king, nor shall you swear by your head, because you cannot make one hair white or black. And yes, you can do the artificial thing, but you can't do the real thing, your hair. But let your yes be yes, and your...