Zechariah 8:22
Yea, many people and strong nations shall come to seek the Lord of hosts in Jerusalem, and to pray before the Lord.
Cross-reference
Isaiah 55:5 says nations run to Israel because of God — a strong parallel to the nations seeking the Lord here.
Isaiah 60:3-22 elaborates on nations streaming to Jerusalem's light — a direct thematic match.
Isaiah 66:23 depicts all flesh coming to worship before God — a clear parallel to the eschatological gathering.
Micah 4:3 shows nations coming to the mountain to learn war no more — a strong parallel to the pilgrimage of nations.
Haggai 2:7 says treasures of all nations will come to the temple — a parallel of nations bringing tribute to God's house.
Revelation 21:24 depicts nations walking by God's light and bringing glory into the New Jerusalem—a direct fulfillment of the universal pilgrimage.
In 2 Chronicles 6:32, Solomon prays for foreigners who come to the temple to seek God—an OT anticipation of nations gathering in Jerusalem.
Isaiah 45:14 describes Gentiles coming to Israel and saying 'God is with you'—a strong parallel to the nations seeking the LORD in Jerusalem.
Galatians 3:8 cites the promise that all nations will be blessed in Abraham — a NT echo of the universal scope of salvation.
Isaiah 14:1 promises that sojourners will join Israel—a similar picture of non-Israelites attaching to God's people in the land.