21 Were you called while a slave? Do not be concerned about it; but if you can be made free, rather use it. 22 For he who is called in the Lord while a slave is the Lord’s freedman. Likewise he who is called while free is Christ’s slave. 23 You were bought at a price; do not become slaves of men. 24 Brethren, let each one remain with God in that state in which he was called.” (1 Corinthians 7:21–24, NKJV)
One’s salvation in Christ does not depend on whether the person is a slave or free at the time of conversion. If the converted slave can become free, then do so. If not, then be a faithful Christian as a slave. The slave who is a Christian is free from sin in the Lord (John 8:34-36). When the person who is not a slave becomes a bondservant of God upon his conversion to Christ (1 Peter 2:16). Whether slave or free, we are all one in Christ (Galatians 3:28). What we must not do is enslave our faith to another person. Christ has redeemed us with His blood, therefore, we belong to Him. We serve Him before anyone else. This is the principle undergirding the instruction in 1 Corinthians 7:15 to let the unbeliever “depart” if that person is unwilling to be married to a believer who serves Christ first. We must “remain with God” and not compromise our faith for the sake of others (verse 23). This means we must abide in the word of Christ instead of following the dictates of others – including an unbelieving spouse (John 8:31-32).