14:4 mount of Olives. As Christ ascended from Mt. Olivet, there He shall stand again (Acts 1:11-12).
14:4 shall cleave. The great splitting of the Mount of Olives, beneath which are known to exist even now great fault lines, will probably result from the global earthquake of Revelation 16:18-19.
14:5 the earthquake. This earthquake is also mentioned in Amos 1:1, and must have been a terrible catastrophe, to be remembered so long—approximately three hundred years by the time of Zechariah. Geologists have generally confirmed this.
14:5 the saints with thee. When the Lord Jesus—the Messiah—does return at this time, He will, indeed, be accompanied by a host of “saints” (or “holy ones”). These will include both angels and redeemed men and women in their resurrection bodies (see II Thessalonians 1:7, I Thessalonians 3:13; 4:16-17; Revelation 19:7-14).
14:6 that day. The phrase “in that day” refers to “the day of the LORD,” the period when God is judging and cleansing the earth and its inhabitants. It occurs twenty-one times in the book of Zechariah—first in Zechariah 2:11, last in 14:21.
14:7 shall be light. The strange atmospheric phenomena described in Zechariah 14:6-7 may be related in some way to the great earthquake, but may as well be entirely supernatural, events properly heralding the personal presence of the Creator.
14:8 living waters. Emerging from a great aquifer beneath Jerusalem, and released by the earthquake, two great rivers will flow, one to the Dead Sea, one to the Mediterranean. See the more detailed account of these waters in Ezekiel 47:1-12. There were similar rivers in Eden, flowing out from God, and there will also be such in the New Jerusalem (Genesis 2:10-14; Revelation 22:1-2). All of these are literal models of the great spiritual prototype, the living water from Christ Himself (Isaiah 44:3; John 4:14; 7:37-39; Revelation 22:17).
14:9 one LORD. No more will men worship the creation rather than the Creator, by way of thousands of pantheistic, polytheistic delusions. All will know and obey the one God, our Creator/Savior, through Jesus Christ (Philippians 2:9-11; Ephesians 1:21; etc.).