'Bound' in the Bible

But if the unbeliever wants a divorce, let it take place. In these circumstances the brother or sister is not bound. God has called you in peace.

The one bound to a wife should not seek divorce. The one released from a wife should not seek marriage.

A wife is bound as long as her husband is living. But if her husband dies, she is free to marry anyone she wishes (only someone in the Lord).