And it shall be, that whoso will not come up of all the families of the earth unto Jerusalem to worship the King, the LORD of hosts, even upon them shall be no rain.

Jamieson-Fausset-Brown Bible Commentary

17. no rain-including every calamity which usually follows in the East from want of rain, namely, scarcity of provisions, famine, pestilence, &c. Rain is the symbol also of God's favor (Ho 6:3). That there shall be unconverted men under the millennium appears from the outbreak of Gog and Magog at the end of it (Re 20:7-9); but they, like Satan their master, shall be restrained during the thousand years. Note, too, from this verse that the Gentiles shall come up to Jerusalem, rather than the Jews go as missionaries to the Gentiles (Isa 2:2; Mic 5:7). However, Isa 66:19 may imply the converse.

Matthew Henry's Concise Commentary

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.