מלכים א יט:ט פירוש: רש״י

To the cave. That is the cleft of the rock where Moshe stood.³Shemos 33:22. The cave that Eliyahu entered is “the cleft of the rock” in which Moshe stood while God’s Divine Presence passed.⁴See Maseches Megillah 19b and Rashi there.