Isaiah 5:27 Kabbalah

אֵין־עָיֵ֤ף וְאֵין־כּוֹשֵׁל֙ בּ֔וֹ לֹ֥א יָנ֖וּם וְלֹ֣א יִישָׁ֑ן וְלֹ֤א נִפְתַּח֙ אֵז֣וֹר חֲלָצָ֔יו וְלֹ֥א נִתַּ֖ק שְׂר֥וֹךְ נְעָלָֽיו׃

None shall be weary nor stumble among them; None shall slumber nor sleep; Neither shall the girdle of their loins be loosed, Nor the latchet of their shoes be broken;

Read kabbalistic (mystical) interpretation of Isaiah 5:27: and classical mystical sources.