I heard the rainbow is spiritually symbolic. What is it symbolic of?


Let's look at the passage of scripture you are referring to:
Then God spoke to Noah and to his sons with him, saying: "And as for Me, behold, I establish My covenant with you and with your descendants after you, and with every living creature that is with you: the birds, the cattle, and every beast of the earth with you, of all that go out of the ark, every beast of the earth. Thus I establish My covenant with you: Never again shall all flesh be cut off by the waters of the flood; never again shall there be a flood to destroy the earth."

And God said: "This is the sign of the covenant which I make between Me and you, and every living creature that is with you, for perpetual generations: I set My rainbow in the cloud, and it shall be for the sign of the covenant between Me and the earth. It shall be, when I bring a cloud over the earth, that the rainbow shall be seen in the cloud; and I will remember My covenant which is between Me and you and every living creature of all flesh; the waters shall never again become a flood to destroy all flesh."
(Gen. 9:8-15)
As you can see from this section of Scripture, the rainbow is a sign of the covenant God made with Noah on behalf of every living creature on the earth then and forever.

That covenant or contract states that He will never again destroy all flesh or living things of the earth with floodwaters. Thank God for His wonderful promise symbolized by His rainbow.

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