Zechariah 14:4 in the King James Version
And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, and there shall be a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south.
Context
3 Then the LORD will go out and fight against those nations, as when he fought in the day of battle.
4 His feet will stand in that day on the Mount of Olives, which is before Jerusalem on the east; and the Mount of Olives will be split in two from east to west, making a very great valley. Half of the mountain will move toward the north, and half of it toward the south.
5 You shall flee by the valley of my mountains, for the valley of the mountains shall reach to Azel. Yes, you shall flee, just like you fled from before the earthquake in the days of Uzziah king of Judah. The LORD my God will come, and all the holy ones with you.