Vayikra: Chapter 1
"And Hashem called to Moses"

Rabbi Elazar begins by telling us that through the higher letters drawn from Binah and the lower letters drawn from Malchut, the earlier generations gained wisdom in how to manage the activities of the world. They knew how to permutate the letters given to Moses at Mount Sinai. We are told about the two clouds of Moses, one over the Tabernacle and one over the mountain. Rabbi Elazar speaks at length about the movement, role and impact of the various letters and the ministers and angels associated with them. He says that when God called to Moses, the summons to enter the Tabernacle issued forth from the permutations of the letters.