Kabbalah zu Jechezkiel 1:28

10.The revealed world, which is Rachel, the Female principle of Zeir Anpin who is located from his Chest downward, is similarly unified below. The revealed world is the lower world, as can be proven by reading the scriptures, where it is described in terms of seeing: "I saw Hashem" (Isaiah 6:1), "and they saw the Elohim of Yisrael" (Exodus 24:10), "and the glory of Hashem appeared (Numbers 14:10) and "As the appearance of the rainbow...so was the appearance of the brightness round about. This was the appearance of the likeness of the glory of Hashem" (Ezekiel 1:28). And it is known that the lower Female principle, who is called Rachel, is described by the words: "Glory of Hashem" and by the particle Et (the). This is the secret of the verse: "Let the dry land appear (lit. 'be seen')," because "seeing" applies only to the revealed world and not to the upper world. The verse: "As the appearance of the rainbow," which is written about the divine Chariot of Yechezkel, alludes to the life of the worlds, namely Yesod of Zeir Anpin. Therefore, it is written in the portion of Noah: "I have set My rainbow in the cloud" (Genesis 9:13), which also alludes to Yesod of Zeir Anpin, who is called the life of the worlds. The phrase "in the cloud" refers to Malchut; namely, the lower Female principle of Zeir Anpin, the revealed world of Rachel. The words "I have set" mean that he has set his rainbow in the cloud ever since the day of Creation.

That cloudy day, which is described in the verse: "And it shall come to pass, when I bring a cloud" (Ibid. 14) indicates that only then shall the rainbow be seen according to the secret of "the appearance of the likeness of the glory of Hashem," and not at any other time. Why is this so? As the left is aroused, Rachel emerges to her own aspect "and she had hard labor" (Genesis 35:16). Therefore it is said that three angels stay by her side: Michael at one side, {the right side}; Raphael at one side, {in the middle}; and Gabriel at one side, {the left side}. And from them she receives her strength to give birth. These three aspects are the colors seen in the form of the rainbow: white, red and green.