What Does Galatians 4:21–31 Mean?

Galatians 4:21–31 is one of Paul’s most difficult and frequently misunderstood passages.

Paul retells the story of Abraham’s two sons—one born to Hagar and one born to Sarah—and says the women correspond to two covenants. Hagar is associated with slavery and the present Jerusalem, while Sarah corresponds to the Jerusalem above and the freedom of God’s promise.

At first glance, Paul may appear to be using the Old Testament in an arbitrary way. Is he dismissing the historical meaning of Genesis? Is he condemning the Jewish people? Is he saying the Old Testament law was evil?

No.

Paul is making a focused argument within a crisis in the Galatian churches. Gentile believers were being pressured to receive circumcision and place themselves under the Mosaic law as a necessary condition of full membership among God’s people. Paul responds that God’s family is created through His promise fulfilled in Christ, not through human effort, ethnic boundary markers, or reliance upon law-keeping for justification.

The Crisis in Galatia

Paul had preached the Gospel in Galatia. People received the Holy Spirit through faith in Christ.

Afterward, other teachers argued that Gentile Christians needed circumcision and observance of the law to belong fully to Abraham’s family.

Paul viewed this as a threat to the Gospel.

The issue was not whether Christians should obey God. Paul repeatedly calls believers to holy lives shaped by love and the Spirit.

The issue was whether the Mosaic covenant and its identity markers were the basis of justification and covenant membership after the coming of Christ.

Paul’s answer is emphatic: a person is justified through faith in Jesus Christ, not by works of the law.

The Original Story of Sarah and Hagar

Genesis tells how God promised Abraham descendants.

When the promise appeared delayed, Abraham and Sarah attempted to secure an heir through Hagar, Sarah’s servant. Hagar gave birth to Ishmael.

Later, God fulfilled His promise through Sarah, who gave birth to Isaac despite the apparent impossibility of her age.

Both sons were genuinely Abraham’s sons, but they represented different ways of obtaining an heir:

• Ishmael’s birth resulted from ordinary human planning.
• Isaac’s birth resulted from God’s supernatural fulfillment of promise.

Paul builds upon this contrast.

“One by the Slave Woman and One by the Free Woman”

Hagar was enslaved, while Sarah was free.

Paul emphasizes that Ishmael was born “according to the flesh,” while Isaac was born “through promise.”

The word flesh here does not mean the physical body is evil. It points toward human effort operating apart from reliance upon God’s promise.

Abraham attempted to accomplish by ordinary means what God had pledged to provide.

Paul sees a parallel in Galatia. The teachers urging circumcision were inviting believers to secure status through a humanly manageable religious system rather than rest in God’s promise fulfilled in Christ.

What Does Paul Mean by “Allegory”?

Paul explicitly says these things are being interpreted allegorically.

His method should not be confused with uncontrolled allegory in which every detail receives a hidden spiritual meaning unrelated to context.

Paul does not deny the historical reality of Sarah, Hagar, Isaac, and Ishmael. He uses the historical pattern as an extended comparison.

The Greek language can carry the sense of speaking about one thing in terms of another. Paul identifies a correspondence between:

• slave woman and free woman
• human effort and divine promise
• slavery and freedom
• the present order and the heavenly Jerusalem

His interpretation grows from themes already present in Genesis and from the place of Abraham’s promise within the biblical story.

The Two Covenants

Paul says the women correspond to two covenants.

Hagar is linked with Mount Sinai and children in slavery.

This does not mean the covenant at Sinai was sinful. The law was given by God and served a holy purpose.

The problem arises when the law is used as a means of justification or as the final form of God’s redemptive promise after Christ has come.

The law exposes sin, restrains evil, orders Israel’s covenant life, and points forward. It cannot give the life and righteousness that sinners need.

When people seek to establish righteousness through law, the result is bondage because the law condemns every transgressor.

Hagar and the “Present Jerusalem”

Paul connects Hagar with the present Jerusalem because, in his argument, the earthly religious establishment remained under the law and rejected the Messiah in whom the promise reached fulfillment.

This statement must not be turned into contempt for Jewish people.

Paul himself was Jewish. Jesus and the apostles were Jewish. Paul grieved over Israel’s unbelief and affirmed God’s continuing purposes.

His argument is theological, not racial. Jewish and Gentile people alike remain in bondage when they seek righteousness apart from Christ. Jewish and Gentile believers alike become children of promise through faith.

The dividing line is not ethnicity. It is whether one relies upon the promise fulfilled in Jesus.

The Jerusalem Above

Paul contrasts the present Jerusalem with “the Jerusalem above,” which he calls free and “our mother.”

The heavenly Jerusalem represents the final people and city of God—the community created by promise and belonging to the age of fulfillment.

This idea appears elsewhere in the New Testament. Hebrews contrasts Mount Sinai with the heavenly Jerusalem, and Revelation pictures the new Jerusalem descending from God.

Believers already belong to that coming reality because they belong to Christ.

Their primary identity is not secured by earthly status, ancestry, or religious achievement. It comes from God’s gracious promise.

Why Paul Quotes Isaiah 54

Paul quotes Isaiah: “Rejoice, barren woman.”

Isaiah 54 follows the suffering servant passage of Isaiah 53. The barren and desolate woman is promised an unexpected multitude of children after God’s saving work.

The quotation strengthens Paul’s argument that God creates His people through promise and grace.

Sarah’s barrenness was not the end of the story. Israel’s devastation was not the end of the story. The apparent defeat of the Messiah was not the end of the story.

God brings life where human ability cannot.

“You, Brothers and Sisters, Are Children of Promise”

Paul applies the story directly to the Galatians.

Like Isaac, believers are children of promise.

This identity does not arise from natural descent, circumcision, or law observance. It comes through faith in Christ and the work of the Spirit.

Earlier in Galatians, Paul says that all who belong to Christ are Abraham’s offspring and heirs according to promise.

This is not a claim that the church earned Israel’s place or that Gentiles should boast over Jews. It is the announcement that God’s Abrahamic promise reaches the nations through Israel’s Messiah.

The Conflict Between Flesh and Spirit

Paul compares the opposition faced by believers with Ishmael’s treatment of Isaac.

Genesis describes conflict in Abraham’s household, and Paul sees a recurring pattern: humanly established religion resists the freedom of promise.

In Galatia, those who insisted upon circumcision were troubling believers who trusted Christ.

The conflict is not simply between religious and nonreligious people. It can occur inside religious communities whenever grace is threatened by systems of status and control.

“Cast Out the Slave Woman”

Paul quotes Sarah’s demand concerning Hagar and Ishmael.

The language is severe because Paul believes the Gospel is at stake.

He is not commanding Christians to mistreat people or expel Jewish neighbors. He is insisting that law-based justification cannot share authority with the Gospel of grace.

The Galatians must reject the demand that circumcision and Mosaic identity become conditions of salvation.

Grace and works cannot function as two competing foundations of justification.

What the Passage Does Not Teach

Galatians 4:21–31 does not teach that:

• the Old Testament is worthless
• the law came from an evil God
• Jewish ethnicity is inferior
• Christians may live without moral restraint
• every Old Testament narrative may be allegorized freely
• the church should become arrogant toward Israel

Paul’s own writings reject these conclusions.

The passage addresses bondage produced when a temporary covenant administration is used against its fulfillment in Christ.

Christian Freedom

Paul’s argument prepares for Galatians 5: “For freedom Christ has set us free.”

Christian freedom is not autonomous self-rule.

It is freedom:

• from condemnation
• from earning acceptance
• from ethnic barriers to covenant membership
• from the law as a system of justification
• from slavery to sin
• for love
• for life in the Spirit
• for obedience flowing from faith

The same Paul who opposes circumcision as a requirement says faith works through love.

Modern Forms of Bondage

Christians may repeat the Galatian error without debating circumcision.

People can treat the following as grounds of acceptance with God:

• denominational identity
• political alignment
• cultural conformity
• religious rituals
• ministry success
• moral reputation
• family background
• preferred worship style
• theological sophistication

These things may carry varying degrees of value, but none can become the basis of justification.

Only Christ saves.

How Should This Passage Be Applied?

Galatians 4 calls believers to:

• trust God’s promise
• reject performance-based acceptance
• recognize identity in Christ
• refuse religious systems that add requirements to the Gospel
• avoid contempt toward Jewish people
• interpret Old Testament texts within the whole biblical story
• use freedom to love and serve
• stand firm in the grace of Christ

Paul’s contrast is not between a bad Old Testament and a good New Testament. It is between slavery produced by relying upon human achievement and freedom produced by God’s promise.

Believers are children of the free woman because God has done what human effort could never accomplish. In Christ, they receive the promised inheritance by grace.