“And they shall declare my glory among the nations” (v19). Through Isaiah, God declared that when He came to redeem His people Israel, the message of hope would also be for “the nations.” God had revealed Himself in a special way to Abraham and his descendants as part of His global plan of salvation, and now “the time is coming to gather all nations and tongues” (v18). These “brothers” from around the world who answered the call of God would even come to serve as priests and Levites (v20-21).
“All flesh shall come to worship before Me” (v23). No country, ethnic group, or person is overlooked by God. Jesus came to reconcile us to the Father and to one another.