וַיַּעְפִּ֕לוּ לַעֲל֖וֹת אֶל־רֹ֣אשׁ הָהָ֑ר וַאֲר֤וֹן בְּרִית־יְהוָה֙ וּמֹשֶׁ֔ה לֹא־מָ֖שׁוּ מִקֶּ֥רֶב הַֽמַּחֲנֶֽה׃
But they presumed to go up to the top of the mountain; nevertheless the ark of the covenant of the LORD, and Moses, departed not out of the camp.
Read kabbalistic (mystical) interpretation of Numbers 14:44: and classical mystical sources.