1 Corinthians 7:10-12

10 [AC] To the married, however, I give this instruction (not I, but the Lord): [7] A wife should not separate from her husband

11 —and if she does separate she must either remain single or become reconciled to her husband—and a husband should not divorce his wife.

12 To the rest [8] 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;