כִּֽי־הַ֭מֶּלֶךְ בֹּטֵ֣חַ בַּיהוָ֑ה וּבְחֶ֥סֶד עֶ֝לְי֗וֹן בַּל־יִמּֽוֹט׃
For the king trusteth in the LORD, yea, in the mercy of the Most High; he shall not be moved.
Read kabbalistic (mystical) interpretation of Psalms 21:8: and classical mystical sources.