Zechariah 14:3-4

3Then the Lord will go forth and 1fight against those nations, as 2when He fights on a day of battle.

4In that day His feet will 3stand on the Mount of Olives, which is in front of Jerusalem on the east; and the Mount of Olives will be 4split in its middle from east to west by a very large valley, so that half of the mountain will move toward the north and the other half toward the south.