1 Corinthians 7:10, 12
1 Corinthians 7:10 NIV
To the married I give this command (not I, but the Lord): A wife must not separate from her husband.
1 Corinthians 7:12 NIV
To the rest I say this (I, not the Lord): If any brother has a wife who is not a believer and she is willing to live with him, he must not divorce her.