Which Old Testament Laws Should Christians Follow?
For many modern readers, opening the Old Testament can feel like stepping into a confusing legal labyrinth. Nestled alongside timeless poetry and historical narratives are dozens of hyper-specific instructions: prohibitions against wearing mixed fabrics, detailed regulations for sacrificing goats, guidelines for boundary lines, and stern moral commands against murder and theft.
For followers of Jesus, this raises a persistent theological question: Which of these Old Testament laws are Christians still required to follow?
To bring clarity to this text, Christian theologians” most notably Thomas Aquinas and later John Calvin”developed a framework known as the Threefold Division of the Law. While the Hebrew Bible presents its 613 commandments (mitzvot) as a single, unified covenant for ancient Israel, this classic distinction categorizes Mosaic Law into three distinct buckets: Civil, Ceremonial, and Moral.
1. The Civil (Judicial) Law
The civil law served as the legal code for ancient Israel operating as a geopolitical, theocratic nation.
What it included: Property disputes, restitution for theft, rules of warfare, agricultural practices, building codes (such as placing a parapet around a roof), and specific criminal penalties for social misconduct.
Its purpose: To establish order, justice, and civic responsibility tailored to the specific culture, geography, and political structure of the ancient Israelite state.
2. The Ceremonial Law
The ceremonial law governed Israel’s formal worship and its ritual separation from surrounding pagan nations.
What it included: The Levitical priesthood, animal sacrifices, dietary rules (kosher laws), ritual purity practices, circumcision, and sacred festivals like Passover and the Day of Atonement.
Its purpose: To point toward spiritual purity, illustrate the severe cost of sin through sacrifice, and foreshadow the ultimate redemptive work of the Messiah.
3. The Moral Law
The moral law reflects the eternal, unchanging character and holiness of God.
What it included: Loving God, loving neighbor, honoring parents, and prohibitions against murder, adultery, theft, lying, and idolatry.
Its core expression: The Ten Commandments (Decalogue), reinforced by foundational principles found throughout the Torah.
Which Laws Apply to Followers of Jesus Today?
To understand how Jesus changed the believer's relationship to these laws, theologians look to His own words: "Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them" (Matthew 5:17).
Jesus did not discard the Old Covenant carelessly; He brought its dynamic purpose to completion. How that fulfillment impacts each category shapes what Christians practice today.
The Ceremonial Law: Transcended and Fulfilled
Followers of Jesus do not observe the ceremonial laws. The New Testament book of Hebrews explains that the Levitical system of priests and animal sacrifices was a "shadow of the good things to come," rather than the true reality (Hebrews 10:1).
When Jesus died on the cross, He offered the once-for-all sacrifice for human sin, rendering the altar and temple sacrifice system obsolete. Similarly, in Mark 7:19, Jesus declared all foods "clean," ending mandatory dietary restrictions, while the Apostles in Acts 15 confirmed that Gentile believers were not required to be circumcised or observe ceremonial rites. For a Christian to insist on Old Covenant sacrifices today would be to diminish the completeness of Christâ’s work on the cross.
The Civil Law: Expired, But Instructs on "General Equity"
Because Christians are not citizens of an ancient Near-Eastern theocracy, the specific legal statutes of ancient Israel are no longer binding legal codes. Followers of Jesus are not required to build physical parapets on modern roofs, nor do contemporary civil courts enforce Levitical judicial penalties.
However, many traditions note that while the letter of the civil law has expired, the principle behind it’s often called "general equity"”remains instructive. For instance, the law commanding a fence around a flat roof was designed to protect human life from preventable harm. A modern application of that same civil principle might be installing a fence around a backyard swimming pool. The context changes, but the underlying concern for human safety and neighborly love remains valid.
The Moral Law: Binding in Perpetuity
Unlike ceremonial shadows or national statutes, the moral law remains fully binding on followers of Jesus. Because God’s character does not change across covenants, His standards of holiness, love, and justice remain perpetual.
Rather than relaxing the moral law, Jesus actually deepened it in the Sermon on the Mount (Matthew 5-7). He clarified that the commandment "do not murder" applies to harboring malice in one's heart, and "do not commit adultery" extends to lustful intent.
Under the New Covenant, believers do not obey the moral law to earn salvation or earn God's favor. Instead, obedience is the organic result of grace. As the New Testament teaches, the Holy Spirit writes God's law onto human hearts (Hebrews 8:10), empowering believers to live out moral righteousness out of gratitude and love for God.
Summary: The Law of Love
When asked to name the absolute greatest commandment in the Law, Jesus brought all three categories back down to a simple essence:
"Love the Lord your God with all your heart and with all your soul and with all your mind. This is the first and greatest commandment. And the second is like it: Love your neighbor as yourself.All the Law and the Prophets hang on these two commandments." Matthew 22:37-40
For followers of Jesus, the Old Testament is not a dusty collection of discarded rules, nor is it a checklist for self-righteousness. The ceremonial laws reveal the cost of sin and point to the Savior; the civil laws model practical wisdom and fairness; and the moral law shows what it looks like to love God and neighbor in a broken world. By walking in the Spirit, believers fulfill the true intent of the Law: living lives defined by love.
