וְצַ֥ו אֶת־יְהוֹשֻׁ֖עַ וְחַזְּקֵ֣הוּ וְאַמְּצֵ֑הוּ כִּי־ה֣וּא יַעֲבֹ֗ר לִפְנֵי֙ הָעָ֣ם הַזֶּ֔ה וְהוּא֙ יַנְחִ֣יל אוֹתָ֔ם אֶת־הָאָ֖רֶץ אֲשֶׁ֥ר תִּרְאֶֽה׃
But charge Joshua, and encourage him, and strengthen him; for he shall go over before this people, and he shall cause them to inherit the land which thou shalt see.’
Read kabbalistic (mystical) interpretation of Deuteronomy 3:28: and classical mystical sources.