זוהר שמות — דף קלד ע”א

The unity of Shema Israel is that of six words facing six directions, and the unity of Barukh Shem is that of six words of the lower world. The word vaed codes the word echad because the feminine letters permute to veil the unity from the evil eye. In the future both will be openly revealed in one unity. The Shekhinah enters the canopy in secret, and the Other Side departs when the Shekhinah manifests to behold the glory of the King.