The Catechism (2583, allegorical sense, on v. 3) joins Elijah’s hiding in the cleft of the rock until God had passed by to the Transfiguration, where Moses and Elijah behold the unveiled face of the one they sought.
9And when he was come thither, he abode in a cave, and behold the word of the Lord came unto him, and he said to him: What dost thou here, Elias?
10And he answered: With zeal have I been zealous for the Lord God of hosts: for the children of Israel have forsaken thy covenant: they have thrown down thy altars, they have slain thy prophets with the sword, and I alone am left, and they seek my life to take it away.
11And he said to him: Go forth, and stand upon the mount before the Lord: and behold the Lord passeth, and a great and strong wind before the Lord, overthrowing the mountains, and breaking the rocks in pieces: but the Lord is not in the wind. And after the wind, an earthquake: but the Lord is not in the earthquake.
12And after the earthquake, a fire: but the Lord is not in the fire. And after the fire, a whistling of a gentle air.
13And when Elias heard it, he covered his face with his mantle, and coming forth, stood in the entering in of the cave, and behold a voice unto him, saying: What dost thou here, Elias? And he answered:
14With zeal have I been zealous for the Lord God of hosts: because the children of Israel have forsaken thy covenant: they have destroyed thy altars, they have slain thy prophets with the sword; and I alone am left, and they seek my life to take it away.