לֹ֤א יִֽיגְעוּ֙ לָרִ֔יק וְלֹ֥א יֵלְד֖וּ לַבֶּהָלָ֑ה כִּ֣י זֶ֜רַע בְּרוּכֵ֤י יְהוָה֙ הֵ֔מָּה וְצֶאֱצָאֵיהֶ֖ם אִתָּֽם׃
They shall not labour in vain, Nor bring forth for terror; For they are the seed blessed of the LORD, And their offspring with them.
Read kabbalistic (mystical) interpretation of Isaiah 65:23: and classical mystical sources.