זוהר שמות — דף ריו ע”ב

After fear and love have been unified, one must unify all the limbs and join the two tabernacles as one. The secret of the Name YHVH Eloheinu: the Yod unites with the He, the inner palace hiding the supernal point. This is the unification of Rav Hamnuna Sava, transmitted from father to son back to Elijah. Echad unifies above, below, and the four directions of the world in one bond to the Infinite. The Exodus from Egypt is recalled because the Shekhinah was then in exile.