Matthew 5:36

A Conservative Version

Neither shall thou swear by thy head, because thou cannot make one hair white or black.

See the chapter Copy

And which of you by being anxious can add one cubit to his age?

And which man of you by being anxious can add one cubit to his life span?

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

But let your word be, Yes, yes, No, no. And anything beyond these is from evil.