וּבָ֙אוּ֙ בִּמְעָר֣וֹת צֻרִ֔ים וּבִמְחִלּ֖וֹת עָפָ֑ר מִפְּנֵ֞י פַּ֤חַד יְהוָה֙ וּמֵהֲדַ֣ר גְּאוֹנ֔וֹ בְּקוּמ֖וֹ לַעֲרֹ֥ץ הָאָֽרֶץ׃
And men shall go into the caves of the rocks, And into the holes of the earth, From before the terror of the LORD, And from the glory of His majesty, When He ariseth to shake mightily the earth.
Rashi on Isaiah
And they shall come [i.e.,] the inhabitants of the earth shall come into the caves of the rocks.