זוהר שמות — דף רנד ע”א

The Zohar explains the mystery of holy kisses — true joy and love are fulfilled only through the attachment of mouth to mouth and breath to breath. From there divine abundance flows to the lower worlds to illuminate souls. That is why it is written: “Let him kiss me with the kisses of his mouth.” In the seventh palace, all mysteries and grades unite to become one. This palace contains everything and concentrates the abundance from the innermost point of holiness.