He [Ezekiel] further says, "As the appearance of the bow that is in the cloud in the day of the rain, so was the appearance of the brightness round about. This was the appearance of the likeness of the glory," (i. 28). The substance and the true essence of the bow described here is well known. The simile and comparison is in this case very extraordinary, and is undoubtedly part of the prophecy; and note it well.
Ch.7 - Guide for the Perplexed (c. 1190) - Part III