What Does the Bible Say About War?
The Bible records war, limits it, and longs for peace. Christ calls His followers to love enemies. Christians have long differed on whether believers may serve in war.
The Bible does not ignore war. It records wars, regulates them, mourns them, and promises a day when they end. Two things stand together in Scripture. First, Christ calls His followers to love their enemies and to be peacemakers: “Blessed are the peacemakers, for they will be called sons of God” (Matthew 5:9). Second, God gives civil rulers authority to restrain evil, and the Bible sometimes describes Him using nations and armies as instruments of judgment. Because both are in the Bible, faithful Christians have reached different conclusions about whether a believer may serve in a war. This article lays out the main views fairly. Whoever you are — soldier, veteran, conscientious objector, or someone just asking — you are welcome to come to Christ, and He receives all who come to Him.
What does the Bible actually say about war?
War appears early. Israel fought to enter the land, and the law of Moses gave rules for battle. Deuteronomy 20:1 says:
When you go out to war against your enemies and see horses, chariots, and an army larger than yours, do not be afraid of them; for the LORD your God, who brought you out of the land of Egypt, is with you. — Deuteronomy 20:1 (BSB)
The prophets also looked past war to peace. Psalm 46:9 says that God makes wars cease and breaks the bow. Isaiah and Micah foresee nations beating swords into plowshares (Isaiah 2:4; Micah 4:3). Jesus said wars and rumors of wars would continue until the end (Matthew 24:6). So the Bible is realistic about a fallen world while still commanding His people to be peacemakers.
Why do wars happen at all?
James gives the deepest answer: “What causes conflicts and quarrels among you? Don’t they come from the passions at war within you? You crave what you do not have” (James 4:1-2). War is a large-scale version of the selfishness in every human heart. That is why the Bible never treats war as simply a clash of good nations against bad ones. All have sinned (Romans 3:23). Any honest Christian view of war begins with humility about our own hearts.
What did Jesus and the apostles teach about enemies?
Jesus went further than the Old Testament’s limits. “But I tell you, love your enemies and pray for those who persecute you” (Matthew 5:44). Paul wrote, “If it is possible on your part, live at peace with everyone” (Romans 12:18). The New Testament also describes the Christian life itself as warfare — but not against people: “For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this world’s darkness” (Ephesians 6:12). Paul says, “For though we live in the flesh, we do not wage war according to the flesh” (2 Corinthians 10:3). Every Christian, whatever their view of military service, is called to this spiritual fight (1 Timothy 6:12).
May a Christian serve in the military? Two main views
Christians have differed on this for centuries, and both views rest on Scripture.
The just-war view. Many Protestant, Catholic and Orthodox Christians hold that a nation may rightly use force to defend the innocent and restrain aggression, and that a believer may serve. They point to Romans 13:1-4, where God gives rulers the sword to punish wrongdoing. They argue that love of neighbor can include protecting the weak. Historically, Augustine and later Thomas Aquinas shaped this view.
The pacifist view. Other Christians — including the historic peace churches such as Mennonites, Quakers and the Church of the Brethren — hold that Jesus’ teaching forbids His followers from taking human life in war. They point to the Sermon on the Mount, to Jesus’ own refusal of violence, and to the early church’s widespread refusal to serve in the Roman army. They argue that the church’s weapon is the gospel, not the sword.
Both sides love Scripture and love Christ. This site does not take a side, because faithful believers, reading the same Bible, have reached different conclusions. If you are facing this decision, talk it through with your pastor and with mature believers who know you.
What do all sides agree on?
Even where Christians differ, they agree on much. War is a terrible fruit of sin, not something to celebrate. God is grieved by the suffering it causes. Believers are called to love their enemies, to pray for those in authority, and to seek peace. No Christian is permitted to hate, to take revenge personally, or to delight in an enemy’s death. And every believer, soldier or not, is engaged in the spiritual battle against the devil, the flesh and the world — a battle fought with truth, faith and prayer, not with hatred.
How should I think and pray about this?
Read the passages above slowly, in context, and ask God for wisdom. Pray for peace, for those who serve, for their families, and for the innocent who suffer in every conflict. If you are considering military service, or wrestling with what you have seen or done, speak with a pastor or a trusted believer in person. If you carry heavy burdens from war, a doctor or licensed counselor can also help. The Bible’s final word is hope: one day the Prince of Peace will reign, and the weapons will be gone. Until then, follow Christ where you are, in a local church, with His Word open.
Common questions
Is it a sin to join the military?
Faithful Christians have answered this differently. Many hold that defending the innocent is a legitimate calling under Romans 13, while others believe Jesus’ teaching rules out military service for His followers. The Bible does not settle the question in one verse, so pray, study Scripture, and seek counsel from your pastor.
What does the Bible say about peace?
The Bible calls peacemakers children of God (Matthew 5:9) and commands believers to live at peace as far as it depends on them (Romans 12:18). The prophets promise a day when God will end war entirely (Isaiah 2:4; Micah 4:3).
Did Jesus ever talk about war?
Jesus said there would be wars and rumors of wars until the end (Matthew 24:6), but He did not command His followers to fight. Instead He told them to love their enemies and pray for those who persecute them (Matthew 5:44).