The gospel of the rainbow

God said, “This is the sign of the covenant that I make between me and you and every living creature that is with you, for all future generations: I have set my bow in the cloud, and it shall be a sign of the covenant between me and the earth. When I bring clouds over the earth and the bow is seen in the clouds, I will remember my covenant that is between me and you and every living creature of all flesh. And the waters shall never again
become a flood to destroy all flesh.”

—Genesis 9:12-15 (ESV)

Yes, it’s the rainbow to which God is referring, but there’s more going on here than that; the rainbow is being used symbolically in a very interesting way. The bow, of course, was a major weapon for hunting; equally of course, it was a major weapon of war, the best way for human beings to kill either animals or each other at a distance. A drawn bow was a sign of hostility; in the ancient Near East, among Israel’s neighbors, stars in the shape of a bow would have been seen as a sign of the hostility of the gods. But here, God has hung his bow in the heavens—pointing up. It isn’t pointing down at the earth to strike, it’s pointing up, away from the earth. Instead of a sign of war and hostility, it’s a sign of peace.

And it’s one other thing, though of course the early readers of Genesis couldn’t know it. God had aimed his wrath against sin at the earth, striking it with the flood; now he would take that wrath and reverse it, aiming it up—at himself, at his own heart. Tim Keller argues, and I think he’s right, that what we’re seeing here is a prefiguring and a foreshadowing of the work of Christ: the rainbow isn’t just a sign of God’s promise that he will never again deal with human sin by flooding the world, it’s an indication of how he will deal with it, by taking all its pain and penalty on himself. God makes this covenant with Noah, he promises never to send another flood, because he already knows that his final victory over sin is going to come a very different way. He knows that while punishing us for our sin—or allowing the consequences of our sin to fall on us, which is often enough the same thing—is frequently necessary, all the punishment in the world will only produce a more cautious and circumspect sinner; it will never make a saint, and what God wants is for us to be saints. To accomplish that, he needs to show us grace, so that we can respond not with fear and the desire to avoid punishment but with love and gratitude and joy.

Thus we have the gospel of the rainbow, which gives the lie to the idea that the God of the Old Testament is somehow different from God as we see him revealed in Jesus. Yes, law is necessary; it’s necessary to show us, so clearly that we cannot avoid the truth, that God’s standards of holiness are too high for us to meet, so that we understand our desperate crying need for grace. Yes, punishment for sin is necessary, for many reasons; as rough as this world can be sometimes, it would be far worse if the evil that we do were never punished. But these things aren’t what God is on about, even in the Old Testament. He doesn’t want to terrify us into obeying him; he wants, rather, to love us into trusting him so that we obey him because we trust him, and love him, and know he loves us. That’s why his ultimate answer to more sin wasn’t more floods, more natural disasters, more judgment; his ultimate answer was the cross.

(Excerpted from “The Covenant of the Rainbow”)