Charles Ellicott Commentary Isaiah 61:6

"But ye shall be named the priests of Jehovah; men shall call you the ministers of our God: ye shall eat the wealth of the nations, and in their glory shall ye boast yourselves." — Isaiah 61:6 (ASV)

But ye shall be named the Priests of the Lord ... — This had been the original ideal of the nation’s life (Exodus 19:6), forfeited for a time through the sins of the people (Exodus 28:1), to be fulfilled at last in the citizens of the new Jerusalem. (Compare to 1 Peter 2:9.) The thought implies, it may be noted, that as Israel has succeeded to the position of the sons of Aaron, so mankind at large is to occupy the position of Israel, as chosen and redeemed. Even the heathen Gentiles shall speak of the new Israel as Ministers of our God.

Ye shall eat the riches of the Gentiles ... — St. Paul seems to see a partial fulfilment of the promise in the collection made among the Gentiles for the Church at Jerusalem (Romans 15:27). On the other hand, the phrase that the conversion of the Jews shall be the riches of the Gentiles (Romans 11:12), affords an illustration of the varying aspects of prophetic imagery.