Matthew 5:32
But I tell you that anyone who divorces his wife, except for sexual immorality, brings adultery upon her. And whoever marries a divorced woman commits adultery.

1 Corinthians 7:11
But if she does, she must remain unmarried or else be reconciled to her husband. And a husband must not divorce his wife.

1 Corinthians 7:13
And if a woman has an unbelieving husband and he is willing to live with her, she must not divorce him.