Interestingly, we only need to look in three places in the Bible to discover the meaning of a rainbow and what certain colors mean. These places to study are found in the books of Genesis, Ezekiel and Revelation.
In the Genesis account, a rainbow appears right after the great worldwide flood brought in order to remove sinful and evil-minded man from the earth. It symbolized God's mercy and thecovenant He made with Noah (representing mankind) not to destroy the world in such a way again.12. And God said, "This is the sign of the covenant which I make between Me and you and every living creature with you, for everlasting generations: 13. I set My rainbow in the cloud, and it shall be the sign of the covenant between Me and the earth . . . and the waters shall no more become a flood to destroy all flesh. (Genesis 9:12, 15, HBFV)
In a way, a cloud which has the bow in it pictures God, as Exodus 13 states."And the Lord went before them by day in a pillar of CLOUD to lead the way . . ." (Exodus 13:21)
In his first vision from God, known as the "wheel in the middle of a wheel" vision, the prophet Ezekiel compares the glory of God to what he saw.
As the rainbow appears that is in the cloud in the day of rain, so was the appearance of His brightness all around (Ezekiel 1:28)
Bows appear again in the prophetic book of Revelation, which foretell the end of man's rule on the earth and the coming of Jesus to set up his Kingdom. The first mention in Revelation appears when the apostle John uses it to describe the glory and power of God on his throne.1. After these things I looked, and behold, a door opened in heaven . . . 3. And He Who was sitting was in appearance like a jasper stone and a sardius stone; and a rainbow was around the throne . . . (Revelation 4:1, 3)