Expiation of Sin

Overview

Expiation of sin names the biblical pattern by which sin’s defilement is removed, carried away, or cleansed so that persons, community, and sanctuary may draw near to God. Rooted in Israel’s priestly and sacrificial vocabulary, the concept focuses on sin as impurity or stain that obstructs access to the holy presence. In the New Testament the same imagery is applied to Jesus: his self-offering and priestly work are portrayed as the decisive act that purifies sin, cleanses conscience, and opens access to God.

Biblical shape

• Creation and sanctuary presence: The logic of expiation presupposes human life made for communion with God and guarded by requirements of purity (e.g., Genesis, Psalm 24). Access to the divine presence presumes right ordering of life and worship.
• Sin as defilement and exile: Scripture frequently treats sin not only as guilt but as polluting uncleanness that harms land, community, and sanctuary (e.g., Genesis 3; Leviticus; Isaiah). This pollution creates the need for removal and cleansing.
• Priestly provision: The priestly system supplies rites—blood, sacrifice, and ritual cleansing—by which impurity is addressed within the covenant. These are commanded rites, not magical acts, and serve covenantal reconciliation (Leviticus, Numbers).
• Day of Atonement pattern: Leviticus 16 provides the paradigmatic ritual: the sanctuary is purified, the people are made clean, and a scapegoat bears the community’s iniquities into the wilderness. That twofold pattern—purification plus removal—frames later reflection.
• Prophetic and psalmic intensification: Prophets and psalms move ritual categories into moral and spiritual language, anticipating divine washing and a renewed heart (Psalm 51; Isaiah; Ezekiel).
• Servant and sin-bearing: Texts such as Isaiah 53 speak of a righteous sufferer who bears and carries sin—vocabulary later read christologically.
• New Testament fulfillment and Hebrews’ logic: John, Paul, 1 Peter, 1 John, and especially Hebrews apply sacrificial and sanctuary imagery to Jesus—Lamb, Passover, and heavenly priest—presenting his once-for-all self-offering as cleansing that sanctifies the people and grants access to the heavenly sanctuary.
• Ecclesial participation: The church is depicted as a purified people whose sins are forgiven and whose conscience is cleansed, living in light of the Lamb’s removal of sin.

Key passages

• Leviticus 16:15–22 — The Day of Atonement rite: purification of sanctuary and the scapegoat bearing Israel’s iniquities.
• Leviticus 17:11 — Blood linked to life and its role in making atonement.
• Numbers 19:9 — Ritual provision for purification and cleansing.
• Psalm 51:1–12 — Psalmic plea for cleansing, renewal, and a pure heart.
• Isaiah 53:4–12 — The servant who bears and makes an offering for transgression.
• John 1:29 — “Behold, the Lamb of God, who takes away the sin of the world.”
• Hebrews 9:11–14 — Christ’s superior, once-for-all sacrifice that cleanses conscience.
• 1 John 1:7–9 — Walking in the light and the cleansing blood of Jesus tied to forgiveness.

Theological significance

Expiation centers on the removal or