אִם־יִרְאוּ֙ אֶת־הָאָ֔רֶץ אֲשֶׁ֥ר נִשְׁבַּ֖עְתִּי לַאֲבֹתָ֑ם וְכָל־מְנַאֲצַ֖י לֹ֥א יִרְאֽוּהָ׃
surely they shall not see the land which I swore unto their fathers, neither shall any of them that despised Me see it.
Read kabbalistic (mystical) interpretation of Numbers 14:23: and classical mystical sources.