And [Jesus] did the same with the cup after supper, saying, “This cup that is poured out for you is the new covenant in my blood.”
The way the Bible talks about blood can sound pretty odd to us today. But when you dig into the way Jesus spoke of his blood, you learn that God was bringing us into a permanent, loving relationship with himself through the death of Jesus. That’s what Jesus promised. Even if we don’t understand the nuances, we can rejoice in the saving power of Jesus’s blood.
Years ago, a friend of mine was distressed when his four-year-old daughter came home from Sunday School and announced, “Daddy, I’m washed in the blood of Jesus.” As a faithful Christian, my friend wasn’t put off by the fact that Jesus’s death saved his daughter. But he was concerned that she was being taught things she really couldn’t understand. When he asked her what it meant to be washed in the blood of Jesus, she explained that she had literally bathed in a bathtub full of Jesus’s actual blood, though she couldn’t tell him when this had happened.
There is a lot of blood in the Bible, and much of what is said about it feels foreign to us. We do not, for example, sacrifice animals as a regular element of our worship. We may even find biblical talk of blood to be unsettling. It’s not unusual to hear critics of Christianity find its preoccupation with blood to be offensive.
That’s not new, actually. One of the oldest attacks on Christians was that they practiced cannibalism. This seems to have been based on a misunderstanding of the words of Jesus as they were repeated in Christian celebrations of Communion. Opponents of Christianity envisioned believers killing each other and drinking their blood.
Even if we know that’s nonsense, we might still find it odd that Jesus said at the Last Supper, “This cup that is poured out for you is the new covenant in my blood” (Luke 22:20). Even if we know that Jesus was pointing to his imminent death, we might still be perplexed by the association of blood and covenant. What’s this all about?
The answer to that question comes from a couple of Old Testament passages. In Exodus, when it was time for the people to accept the law God had revealed to Moses and enter into a covenant (sacred binding contract) with the Lord, Moses read the law to them and they agreed to abide by it. Then Moses took blood and dashed it on the people as a sign and seal of their commitment (see Exodus 24:3-8).
The second Old Testament passage appears in the prophecies of Jeremiah. Through the prophet, the Lord promised to “make a new covenant with the house of Israel and the house of Judah” (Jeremiah 31:31). This new covenant would be written on the hearts of the people. They would know God, who would forgive their sin and remain in a relationship with them forever (31:34). As the Lord said, “I will be their God, and they shall be my people” (31:33).
Jesus revealed that the time of the new covenant had finally come. This covenant, like the first, would be sealed by blood, but not the blood of animals sprinkled on human beings. Rather, the new covenant would be sealed by the shed blood of Jesus. His death – signified by his blood – would bring about a new, deep, lasting relationship between God and people.
I don’t have time here to get into an explanation of why the blood of Jesus has such power. For now, I will simply point with awe and gratitude to the extraordinary power of his blood.
As I write this, I hear in my memory a wonderful hymn, sung with great pathos the 19th-century hymn by Lewis Jones, “Power in the Blood”:
Would you be free from the burden of sin? There’s pow’r in the blood, pow’r in the blood; Would you o’er evil a victory win? There’s wonderful pow’r in the blood. Would you be free from your passion and pride? There’s pow’r in the blood, pow’r in the blood; Come for a cleansing to Calvary’s tide– There’s wonderful pow’r in the blood. There is pow’r, pow’r, wonder-working pow’r In the blood of the Lamb; There is pow’r, pow’r, wonder-working pow’r In the precious blood of the Lamb.
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