"Again you have heard that it was said to the men of old, 'You shall not swear falsely, but shall perform to the Lord what you have sworn.'
But I say to you, Do not swear at all, either by heaven, for it is the throne of God,
or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King.
And do not swear by your head, for you cannot make one hair white or black.
Let what you say be simply 'Yes' or 'No'; anything more than this comes from evil.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved. (Revised Standard Version - Holy Bible)