zechariah 14:16 And it shall come to pass, that every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the LORD of hosts, and to keep the feast of tabernacles. - Free Bible Online

      16. every one . . . left-- (Isa 66:19, 23). God will conquer all the foes of the Church. Some He will destroy; others He will bring into willing subjection.
      from year to year--literally, "from the sufficiency of a year in a year."
      feast of tabernacles--The other two great yearly feasts, passover and pentecost, are not specified, because, their antitypes having come, the types are done away with. But the feast of tabernacles will be commemorative of the Jews' sojourn, not merely forty years in the wilderness, but for almost two thousand years of their dispersion. So it was kept on their return from the Babylonian dispersion (Ne 8:14-17). It was the feast on which Jesus made His triumphal entry into Jerusalem (Mt 21:8); a pledge of His return to His capital to reign (compare Le 23:34, 39, 40, 42; Re 7:9; 21:3). A feast of peculiar joy (Ps 118:15; Ho 12:9). The feast on which Jesus gave the invitation to the living waters of salvation ("Hosanna," save us now, was the cry, Mt 21:9; compare Ps 118:25, 26) (Joh 7:2, 37). To the Gentiles, too, it will be significant of perfected salvation after past wanderings in a moral wilderness, as it originally commemorated the ingathering of the harvest. The seedtime of tears shall then have issued in the harvest of joy [MOORE]. "All the nations" could not possibly in person go up to the feast, but they may do so by representatives.

JFB.