To the married I give this command (not I, but the Lord): A wife must not separate from her husband.
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 Chapter 7: Verses 10 - 11
And if a woman has a husband who is not a believer and he is willing to live with her, she must not divorce him.
For the unbelieving husband has been sanctified through his wife, and the unbelieving wife has been sanctified through her believing husband. Otherwise your children would be unclean, but as it is, they are holy.
But if the unbeliever leaves, let him do so. A believing man or woman is not bound in such circumstances; God has called us to live in peace.
1 Corinthians Chapter 7: Verses 13 - 15