זוהר שמות — דף קלז ע”ב

The sun revolves through all the holy sefirot and nothing is hidden from that light. When all are completed and illuminated from the sun, the moon adorns itself like the supernal Mother complete in fifty gates. The Torah of the Lord is perfect: it comes in groups of five words to complete the secret of the fifty. On the day of Shabbat, the heavens rise in the holy Name and everything is completed in the secret of Shabbat above and below.