(Isa. 2:10, 19; Rev. 6:16)
Concerning the prayer that mountains fall to crush and hide, Farrar (Life of Christ, 645, note), says: “These words of Christ met with a painfully literal illustration when hundreds of the unhappy Jews at the siege of Jerusalem hid themselves in the darkest and vilest subterranean recesses, and when, besides those who were hunted out, no less than two thousand were killed by being buried under the ruins of their hiding places. A further fulfilment may be yet future.”
(James E. Talmage, Jesus The Christ: A Study of the Messiah and His Mission According to Holy Scriputres Both Ancient and Modern [Salt Lake City: The Church of Jesus Christ of Latter-day Saints, 1981] 667.)
To say that men shall go into the holes of the rocks and into the caves of the earth is very descriptive of some areas of the Middle East. Many poor, then and now, live amid the caves and rocks. Often in history, men would flee to the mountains to hide in the rocks when threatened by destruction or war. The Qumran community hid the Dead Sea Scrolls in caves.
(Loren D. Martin, Isaiah: An Ensign to the Nations [Salt Lake City: Valiant Publications, 1982], 67.)