“Again, you have heard that it was said to the people long ago, ‘Do not break your oath, but fulfill to the Lord the vows you have made.’
References for Matthew 5:33
But I tell you, do not swear an oath at all: either by heaven, for it is God’s throne;
References for Matthew 5:34
or by the earth, for it is his footstool; or by Jerusalem, for it is the city of the Great King.
References for Matthew 5:35
And do not swear by your head, for you cannot make even one hair white or black.