Zechariah 14:3-4

3And Jehovah will go forth and fight with those nations, as when he fought in the day of battle.

4And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem toward the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, — a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south.