Isaiah 66:20

The message having gone out, the Gentiles will escort the Israelites back to the Promised Land-and the holy city of Jerusalem-as a thank offering to the Lord (cf. Zechariah 8:23; John 11:52). Evidently many Israelites will believe on the Lord Jesus Christ during the Tribulation and will return to their ancient homeland to worship Him (cf. Isaiah 11:10-16). Jews will evangelize Gentiles (Isaiah 66:19), and Gentiles will evangelize Jews.

"The only offering brought in a container was the firstfruits (Deuteronomy 26:2). The converts of the nations come as the firstfruits of the harvest of the world-not a token of what will yet come but as that which is notably holy and peculiarly the Lord’s." [Note: Motyer, p. 542.]