12 But this is what will happen to all who fought against Jerusalem: God will visit them with a terrible plague. People's flesh will rot off their bones while they are walking around; their eyes will rot in their sockets and their tongues in their mouths; people will be dying on their feet! 13 Mass hysteria when that happens - total panic! Fellow soldiers fighting and killing each other - holy terror! 14 And then Judah will jump into the fray! 15 The plague will also hit the animals - horses, mules, camels, donkeys. Everything alive in the military camps will be hit by the plague.

16 All the survivors from the godless nations that fought against Jerusalem will travel to Jerusalem every year to worship the King, God-of-the-Angel-Armies, and celebrate the Feast of Booths. 17 If any of these survivors fail to make the annual pilgrimage to Jerusalem to worship the King, God-of-the-Angel-Armies, there will be no rain. 18 If the Egyptians don't make the pilgrimage and worship, there will be no rain for them. Every nation that does not go up to celebrate the Feast of Booths will be hit with the plague.

Matthew Henry's Commentary on Zechariah 14:12-18

Commentary on Zechariah 14:8-15

(Read Zechariah 14:8-15)

Some consider that the progress of the gospel, beginning from Jerusalem, is referred to by the living waters flowing from that city. Neither shall the gospel and means of grace, nor the graces of the Spirit wrought in the hearts of believers by those means, ever fail, by reason either of the heat of persecution, or storms of temptation, or the blasts of any other affliction. Tremendous judgments appear to be foretold, to be sent upon those who should oppose the settlement of the Jews in their own land. How far they are to be understood literally, events alone can determine. The furious rage and malice which stir up men against each other, are faint shadows of the enmity which reigns among those who have perished in their sins. Even the inferior creatures often suffer for the sin of man, and in his plagues. Thus God will show his displeasure against sin.

Commentary on Zechariah 14:16-21

(Read Zechariah 14:16-21)

As it is impossible for all nations literally to come to Jerusalem once a year, to keep a feast, it is evident that a figurative meaning must here be applied. Gospel worship is represented by the keeping of the feast of tabernacles. Every day of a Christian's life is a day of the feast of tabernacles; every Lord's day especially is the great day of the feast; therefore every day let us worship the Lord of hosts, and keep every Lord's day with peculiar solemnity. It is just for God to withhold the blessings of grace from those who do not attend the means of grace. It is a sin that is its own punishment; those who forsake the duty, forfeit the privilege of communion with God. A time of complete peace and purity of the church will arrive. Men will carry on their common affairs, and their sacred services, upon the same holy principles of faith, love and obedience. Real holiness shall be more diffused, because there shall be a more plentiful pouring forth of the Spirit of holiness than ever before. There shall be holiness even in common things. Every action and every enjoyment of the believer, should be so regulated according to the will of God, that it may be directed to his glory. Our whole lives should be as one constant sacrifice, or act of devotion; no selfish motive should prevail in any of our actions. But how far is the Christian church from this state of purity! Other times, however, are at hand, and the Lord will reform and enlarge his church, as he has promised. Yet in heaven alone will perfect holiness and happiness be found.