Matthew 5:32-36

but I say to you that everyone who divorces his wife, except for the reason of sexual immorality, makes her commit adultery; and whoever marries a divorced woman commits adultery.

“Again, you have heard that the ancients were told, ‘ You shall not make false vows, but shall fulfill your vows to the Lord.’

But I say to you, take no oath at all, neither by heaven, for it is the throne of God,

nor by the earth, for it is the footstool of His feet, nor by Jerusalem, for it is the city of the great King.

Nor shall you take an oath by your head, for you cannot make a single hair white or black.