Matthew 5:31
31 “It was said, ‘Whoever sends his wife away, let him give her a certificate of divorce’;
32 but I say to you that everyone who divorces his wife, except for the reason of unchastity, makes her commit adultery; and whoever marries a divorced woman commits adultery.
New American Standard Bible: 1995 Update. 1995. La Habra, CA: The Lockman Foundation.