To the married, however, I give this instruction (not I, but the Lord): A wife should not separate from her husband —and if she does separate she must either remain single or become reconciled to her husband—and a husband should not divorce his wife.
To the rest I say (not the Lord): if any brother has a wife who is an unbeliever, and she is willing to go on living with him, he should not divorce her; and if any woman has a husband who is an unbeliever, and he is willing to go on living...
1 Corinthians 7:10–24