לֹֽא־יִתְיַצֵּ֥ב אִישׁ֙ לְפָנֶ֔יךָ כֹּ֖ל יְמֵ֣י חַיֶּ֑יךָ כַּֽאֲשֶׁ֨ר הָיִ֤יתִי עִם־מֹשֶׁה֙ אֶהְיֶ֣ה עִמָּ֔ךְ לֹ֥א אַרְפְּךָ֖ וְלֹ֥א אֶעֶזְבֶֽךָּ׃
There shall not any man be able to stand before thee all the days of thy life; as I was with Moses, so I will be with thee; I will not fail thee, nor forsake thee.
Read kabbalistic (mystical) interpretation of Joshua 1:5: and classical mystical sources.