1 Corinthians 7:2, 28, 36, 39
1 Corinthians 7:2 NIV
But since sexual immorality is occurring, each man should have sexual relations with his own wife, and each woman with her own husband.
1 Corinthians 7:28 NIV
But if you do marry, you have not sinned; and if a virgin marries, she has not sinned. But those who marry will face many troubles in this life, and I want to spare you this.
1 Corinthians 7:39 NIV
A woman is bound to her husband as long as he lives. But if her husband dies, she is free to marry anyone she wishes, but he must belong to the Lord.