Matthew 5:35-37

Living Bible

³⁵ And if you say ‘By the earth!’ it is a sacred vow, for the earth is his footstool. And don’t swear ‘By Jerusalem!’ for Jerusalem is the capital of the great King. ³⁶ Don’t even swear ‘By my head!’ for you can’t turn one hair white or black. ³⁷ Say just a simple ‘Yes, I will’ or ‘No, I won’t.’ Your word is enough. To strengthen your promise with a vow shows that something is wrong.