זוהר שמות — דף ריג ע”ב

Below this, all those firmaments are included in this Name called Heaven. These are called the Heavens in which the supernal Name is named, those in which the Holy Name is crowned. Therefore it is written "The heavens are the heavens of the Lord." The heavens are the vessel in which the supernal Name is revealed. The expression "the heavens, the heavens" alludes to the duality of the physical and spiritual heavens, both dedicated to the Holy Name.