Sermon- Zechariah 14-15-21-Holy to the LORD--Introduction- To understand Old Testament prophecy----I. In the future, God's people will be a world-wide people.- A. vv.16, 17, 18 ----- B. Rev. 7-9 ---- C. Applications---II. In the future, God's people will be a thankful people. -A. -feast of booths-----B. John 7-38, Colossians 3-15, 16, 17 -----III. In the future, God's will be a worshipping people. - A. v. 16 cf. v. 17 ------IV. In the future, God's people will be a holy people.- A. vv. 20-21----Summary of the book- How- The work of the Messiah.