Matthew 5:35-37

Worldwide English (New Testament)

³⁵ Do not use the name of earth, because that is where God rests his feet. Do not use the name of Jerusalem, because it is the city of the great King.

³⁶ Do not make a promise by your head, because you cannot make one hair of your head white or black.

³⁷ You must mean "Yes" when you say "Yes". You must mean "No" when you say "No". To say anything more than that is wrong.'