Acharei Mot: Chapter 63

"Hashem shall be one, and His name One"


We are told that Hashem is not One now because Zeir Anpin and Malchut are parted, and at present the flow from Binah does not sustain Zeir Anpin. In the future, however, God will return the Shechinah to her position and everything will find itself in one unity. Before that final unity, the kingdom of Esau will be judged.