Acharei Mot: Chapter 66
The Holy Name is engraved in certain ways

We learn how the Holy Name is engraved with the 22 letters, and what this has to do with the flow from above. The section talks about the secret of seventy and 72, and about how the letters of the name Ayin-Bet ascended in ways known only to truly righteous men. Whoever wishes to know and understand the permutations of the Holy Names needs to know the letters marked in every individual Sfirah, and then he will know and have power in everything. Moses was able to stand among the holy angels because he knew the Holy Names that the angels did not.