Beshalach: Chapter 34
"And they saw the Elohim of Yisrael"

This section proscribes looking at the rainbow above, the Shechinah, and the rainbow below, the sign of the Covenant that is imprinted on a person. Rabbi Chiya talks about the sapphire stone in "And there was under his feet a kind of paved work of sapphire stone," saying that it means the transparent light of the sapphire, the engravings of above that flash and illuminate. The borders in the great tree illuminate the Shechinah when she joins with Zeir Anpin; all these lights and paths illuminate upon the light of the Shechinah.