The appearance of the brilliant light all around Him was like that of a rainbow in a cloud on a rainy day. This was the appearance of the likeness of the glory of the LORD. And when I saw it, I fell facedown and heard a voice speaking.
The Prophet now adds, that the likeness of a celestial bow was presented to him, which profane men call his, and imagine that she performs the commands of the gods, and especially of Juno. But Scripture calls it the bow of God, not because it was created after the Deluge, as many falsely suppose, but because God wished to stir up our hope with that...
Everything before this vision points to Christ alone. Angels serve Him; men are His instruments. He appears here as the Son of Man seated above the very firmament that crowns the living creatures, showing that all principalities and powers bow beneath His feet. That He would later lower Himself to be made less than the angels for our sake magnifies beyond measure the grace of His incarnation.
AI summary
Commenting on Ezekiel 1:26-28
As the appearance of the bow that is in the cloud in the day of rain,.... The rainbow, which is no other than the reflection of the rays of the sun in a thin watery cloud on a rainy day: so was the appearance of the brightness round about it; so Christ is represented as clothed with a cloud, and a rainbow about his head...