The Bible does not condone slavery. The Bible acknowledges and responds to slavery's existence, but it does not condone or celebrate it. Slavery exists because of sin. Sin enslaves all of us (John 8:34; Romans 3:23). God responded to our enslavement to sin by freeing us from it (Romans 6:6, 23). Jesus, who is fully God and fully human, lived a sinless life, took our sin on Himself, willingly died in our place, and rose again, proving His sacrifice was sufficient and He is who He claimed to be (1 Corinthians 15:3–5; 2 Corinthians 5:21; Hebrews 4:14–16). All who trust in Him can be freed from the penalty of sin (Ephesians 2:1–10).
In the ancient world, slavery existed for a variety of reasons, the main ones being: debt slavery, slavery for the punishment of a crime, or enslavement as the result of war. Slavery still exists today, with an estimated number of fifty million people living as slaves in 2021. The Bible provides regulations for slavery and the treatment of slaves in both the Old and New Testaments, but God also provides us with a compelling view of how we are to see and treat people (Philippians 2:3–4). God's laws are for our protection, and His heart is for us to truly love others (1 John 3:16). If people followed what the Bible says about slavery, modern slavery would naturally be abolished.
The slavery the Bible condemns is slavery as we know it: harsh, based on taking advantage of people, and with many injustices. Slavery that the Bible refers to positively was more akin to indentured servitude than modern-day slavery. The Bible condemns those who involuntarily seize and sell a person (Exodus 21:16; cf. 1 Timothy 1:8–10) and shows that all people, including slaves, are brothers in the Lord if they are saved (Philemon 1:16). The systematic kidnapping and enslaving of countless Africans in the fifteenth to nineteenth centuries by both Africans and Westerners was absolutely unbiblical—the punishment for those who stole and sold other humans in ancient Israel was death (Exodus 21:16). Paul specifically mentions "enslavers" or "slave traders" and calls them lawless, rebellious, ungodly, unholy, and profane (1 Timothy 1:8–10). The problem of slavery has not gone away. There are more slaves in the world today than at all other times in history combined. Today we call it "human trafficking," and it is just as evil as it was in the ancient world.
Some people condemn the Bible for not abolishing slavery outright. However, the primary goal of the gospel was not sweeping social or political change. Instead, it is individual spiritual change and freeing us from the root cause of all slavery: sin. The Bible teaches that all humans are created by God and made in His image (Genesis 1:27). Yet all people are sinful and in need of salvation (Romans 3:23). Trusting in Christ’s death and resurrection for the forgiveness of sins free us from the penalty of sin (Romans 6:6, 23) yet we still experience the effects of sin. We are also made new, given the indwelling Holy Spirit, and progressively live more as God would have us live, reflecting His character and His righteousness more often than sin (Romans 8:28–30; 2 Corinthians 5:17–21; Ephesians 1:3–14; Philippians 2:12–13; 1 John 1:6—2:6). As hearts are changed, society will change. If the world followed the Bible, the millions of sex-trafficking victims would be freed and cared for, and the vast majority of labor-trafficking victims would be home with their families.