A wife is bound by law as long as her husband lives; but if her husband dies, she is at liberty to be married to whom she wishes, only in the Lord. (1 Corinthians 7:39, NKJV)
The divinely mandated permanency of marriage is reiterated here. The word “bound” signifies to be obligated to – it describes a tie with obligations. While “friends with benefits” popularizes fornication and diminishes marriage, “marriage with obligations” is God’s directive (Romans 7:2; 1 Corinthians 7:27). Marriage is not “until we fall out of love” – it is “until death we do part.” This is why marrying another person while one’s original spouse is alive is adultery (Romans 7:2-3). Marriage cannot be ended on a whim, or on differences we deem to be “irreconcilable.” Only fornication gives the other party in marriage the freedom to put away the offender and marry another (Matthew 19:9). According to Jesus, all other remarriages constitute adultery (Matthew 5:32; 19:9; Mark 10:11-12; Luke 16:18). Death of the spouse to whom God joined you ends marriage’s obligation, freeing one to marry again in harmony with God’s will. We must return to honoring the serious, lifelong obligation one accepts when entering marriage. Otherwise, people will continue dishonoring marriage by putting asunder what God has joined together (Matthew 19:6). Be assured, this sin does not escape the attention of the One to whom we will give account (2 Corinthians 5:10; Hebrews 13:4).