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Why did Jesus die? Charles Simeon is someone I've grown fond of through various biographies. He was a remarkable English pastor who lived in 18th century Cambridge. Writing about his own conversion, Simeon mentions that of all the books of the Bible that might have sealed his remarkable transformation, it wasn't any of the Gospels and it wasn't Romans or Ephesians as you might expect. The book that did it was the Old Testament book of Leviticus. He describes reading about the penitent man laying his hands on an animal without blemish and then seeing the animal slain and its blood sprinkled around the altar. That image absolutely gripped Simeon. Reading a commentary on Leviticus, one sentence in particular struck him deeply. And this was the line that struck him. The Jews knew what they did when they transferred their sin to the head of their offering. The transfer of sin that is being described here is the essence of penal substitutionary atonement. The idea that in order for our sin to be dealt with, someone else must, as our substitute, take the penalty our sin deserves. The fact that we all die is not accidental, as Genesis 3 makes clear. We die because the penalty for our sin is death. So the only way to deal with death is to deal with our sin. The entire sacrificial system of the Old Testament was put in place so that God's people would understand this. God commanded that animal sacrifices be made as a way of showing that sin must be paid for. As they laid hands on an animal, they were symbolically transferring their sin onto the animal which then died in their place. This is what Simeon was reading about in Leviticus. The principles played out dramatically in Exodus chapter 12. At the Passover, an unblemished lamb is slain, its blood daubed around the doorway of each household. The people in the household would cook and eat the lamb to show their identification with it. And as a result, that family was spared. Because the lamb died, they lived. However, as it says In Hebrews chapter 10, it is impossible for the blood of bulls and goats to take away sins. The death of an animal cannot atone for the sin of a human being. And so the animal sacrifices of the Old Covenant were merely intended to point forward toward a greater sacrifice that God would one day provide. This greater sacrifice is described in Isaiah chapter 53, where we read of a man who bears the penalty for the sins of others, so that they would not have to. It says, he was pierced for our transgressions, he was crushed for our iniquities. Upon him was the chastisement that brought us peace. And with his wounds we are healed all we, like sheep, have gone astray. We have turned every one to his own way, and the Lord has laid on him the iniquity of us all. Who is this person Isaiah speaks of? Well, as Hebrews chapter 9 confirms, Jesus Christ is the one to whom Isaiah looked forward. In his death, Jesus put away sin by the sacrifice of himself. Hebrews as well as the book of Romans and first John all describe Jesus death in substitutionary terms. They argue that Jesus death on the cross was a propitiation satisfying the righteous wrath of God by bearing the punishment that we deserve. Similarly, in Galatians, Paul says that Christ redeemed us from the curse of the law by becoming a curse for us. Peter, in a self conscious echoing of Isaiah 53, also writes about that same substitutionary atonement. Christ himself, he says, bore our sins in his body, that we might die to sin and live to righteousness. By his wounds you have been healed. The substitutionary nature of Jesus atonement has been contested by some theologians, and yet it is all over the pages of Scripture. Not in isolated verses, but woven deeply into the fabric of the entire sacrificial system of the old Covenant and then affirmed, as we've seen by the New Testament authors. When you think of it, the idea of the hero willingly giving up his life to save those he loves is written everywhere, not just in the pages of Scripture. Think of Boromir in the Lord of the Rings, Tony Stark in Endgame, Obi Wan Kenobi in Star wars, or my favorite, the Iron Giant, saving people from destruction, even people who are trying to destroy him by deliberately putting himself between them and a nuclear warhead, he dies so that they can live. The idea of substitutionary atonement is everywhere. I believe it's because as creatures made in God's image, struggling with guilt and shame and facing the inevitability of death, we know that we need saving. But we also sense that it cannot be done cheaply or easily. Our predicament is too severe, too desperate, our sin too serious. Death cannot simply be waved away. So who can defeat death? For us to do that, someone would need to deal with our sin. And only one person in history is qualified to take our sin on himself, given that he had no sin of his own. To die for the unblemished Lamb of God who takes away the sin of the world, the one who turned to his friends shortly before he died and said to them, greater love has no one than this. That someone lay down his life for his friends, foreign I'm Barry Cooper and this is, Simply Put, a podcast from Ligonier Ministries. Ligonier creates resources to help Christians know what they believe, why they believe it, how to live it, and how to share it. You can find these resources@ligonier.org and by the way, if you like Simply Put, please subscribe or write a review on your favorite podcast app. Discover more at simplyputpodcast. Com.
Host: Barry Cooper (Ligonier Ministries)
Date: January 27, 2026
Episode Theme:
This episode unpacks the doctrine of penal substitutionary atonement—the biblical teaching that Jesus Christ died as a substitute, bearing the penalty for human sin. Barry Cooper explains the term’s roots in Old Testament sacrifices, its fulfillment in Christ, and its enduring resonance, both scripturally and culturally.
Barry Cooper addresses the foundational theological question: Why did Jesus die? Through accessible storytelling and relatable illustrations, he explores how the idea of penal substitutionary atonement runs through the Bible and provides the answer to humanity’s deepest problem: the need for a substitute to take the penalty for sin.
“‘The Jews knew what they did when they transferred their sin to the head of their offering.’ The transfer of sin…is the essence of penal substitutionary atonement.”
— Barry Cooper [01:35]
The sacrificial system, including animal sacrifices, was instituted to teach that “sin must be paid for.”
At Passover in Exodus 12, the slain lamb and its blood on the doorposts spared families from judgement.
Notable Quote:
“Because the lamb died, they lived.”
— Barry Cooper [03:14]
Hebrews 10: Animal sacrifices pointed ultimately to a greater, sufficient sacrifice, since animal blood “cannot take away sins.”
Isaiah 53 prophesies a suffering figure who bears the punishment for others:
Hebrews 9, Romans, 1 John, Galatians, and 1 Peter all describe Jesus’s death as directly substituting for sinners.
Notable Quote:
“Jesus’s death on the cross was a propitiation, satisfying the righteous wrath of God by bearing the punishment that we deserve.”
— Barry Cooper [04:05]
Paul in Galatians: “Christ redeemed us from the curse of the law by becoming a curse for us.”
Peter echoes Isaiah: “Christ himself… bore our sins in his body, that we might die to sin and live to righteousness. By his wounds you have been healed.”
“The idea of substitutionary atonement is everywhere… because as creatures made in God’s image, struggling with guilt and shame and facing death, we know that we need saving. But we also sense that it cannot be done cheaply or easily.”
— Barry Cooper [05:44]
The desperate state of humanity means death and sin must be truly dealt with, not simply dismissed.
Only a sinless substitute can truly bear others’ sins.
Jesus is the “unblemished Lamb of God who takes away the sin of the world.”
Notable Quote:
“Greater love has no one than this, that someone lay down his life for his friends.”
— Jesus (quoted by Barry Cooper) [07:08]
Barry Cooper’s delivery is warm, accessible, and illustrative, avoiding theological jargon and connecting profound doctrine to both biblical narrative and familiar cultural references. The episode aims to make long-standing doctrine both understandable and personally meaningful, emphasizing both the necessity and beauty of Jesus’s sacrificial death.
Through Old Testament patterns, prophetic expectation, and New Testament fulfillment, Barry Cooper demonstrates that penal substitutionary atonement is not only the heart of Christian doctrine but also a story written into humanity’s collective consciousness: someone willingly bearing the cost so that others may live. For Christians, this is ultimately fulfilled in the self-giving love of Jesus Christ.