What is the significance of the blood of Jesus?

Hymns and prayers about being 'washed in the blood' or 'redeemed by the blood of the Lamb' can sound jarring, even off-putting, to modern ears unfamiliar with the Bible's sacrificial world. But this language is not incidental to the Christian faith; it sits at its very center. To understand why blood carries such weight in Scripture, we need to trace it back to the Old Testament pattern God established long before the cross, and see how Jesus fulfills and completes it. Once you see the pattern clearly, the hymn-writers' language stops sounding strange and starts sounding like the most precise, hope-filled way to describe what actually happened on Good Friday.

Leviticus explains the theological logic behind sacrificial blood directly: 'For the life of the flesh is in the blood, and I have given it for you on the altar to make atonement for your souls, for it is the blood that makes atonement by the life' (Leviticus 17:11). Blood was never treated as some magical substance; it represented life itself, given up in death, standing in the place of the sinner who deserved to die. Hebrews summarizes the entire Old Testament system in one sober sentence: 'without the shedding of blood there is no forgiveness of sins' (Hebrews 9:22). Every lamb, goat, and bull offered at the temple pointed toward this principle — sin's penalty is death, and a substitute's death, through the shedding of its blood, is required to cover it.

The clearest Old Testament picture is the Passover. In Egypt, Israelite households were spared the plague of death only because they marked their doorposts with the blood of a lamb, so that 'when I see the blood, I will pass over you' (Exodus 12:13). Paul draws the direct line to Jesus: 'Christ, our Passover lamb, has been sacrificed' (1 Corinthians 5:7). John the Baptist saw Jesus and declared, 'Behold, the Lamb of God, who takes away the sin of the world!' (John 1:29). What the Passover lamb's blood pictured in shadow, Christ's blood accomplished in reality — deliverance from death for everyone covered by it. Just as the blood on the doorposts had to actually be applied, not merely available in the house, Scripture insists Christ's blood must be personally trusted, not merely admired from a distance, for its covering to take effect (Romans 3:25).

Hebrews is emphatic that the old sacrifices, repeated endlessly, could never actually take away sin: 'For it is impossible for the blood of bulls and goats to take away sins' (Hebrews 10:4). They were shadows, pointing forward, not the substance itself. Christ's blood succeeds precisely because of who shed it — the eternal Son of God, offering Himself 'through the eternal Spirit' (Hebrews 9:14). 'For if the blood of goats and bulls... sanctify for the purification of the flesh, how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our conscience from dead works to serve the living God' (Hebrews 9:13-14). His blood does not merely cover sin externally; it actually cleanses the conscience, removing the guilt that no amount of animal sacrifice could ever touch.

The New Testament piles up rich descriptions of what Christ's blood does for believers. 'In him we have redemption through his blood, the forgiveness of our trespasses' (Ephesians 1:7). 'Since, therefore, we have now been justified by his blood, much more shall we be saved by him from the wrath of God' (Romans 5:9). Those once far from God 'have been brought near by the blood of Christ' (Ephesians 2:13). Believers overcome the accuser 'by the blood of the Lamb' (Revelation 12:11), and John opens his letter to the churches praising the one 'who loves us and has freed us from our sins by his blood' (Revelation 1:5). Jesus Himself instituted the Lord's Supper around this reality, calling the cup 'the new covenant in my blood' (Luke 22:20), a covenant memorial believers still keep.

Far from being a morbid or primitive idea, the blood of Jesus is the reason a sinner can approach a holy God at all. Hebrews concludes, 'we have confidence to enter the holy places by the blood of Jesus, by the new and living way that he opened for us' (Hebrews 10:19-20). When you feel unworthy to pray, unworthy to be forgiven, unworthy to draw near, remember that the price for your access has already been paid — not in good intentions or good behavior, but in the actual, historical, sufficient blood of Christ, shed once for all.