Psalm 117:1-2 and Isaiah 66:18-21

Psalm 117:1-2
1 Alleluia. All nations, praise the Lord. All peoples, praise him.
2 For his mercy has been confirmed over us. And the truth of the Lord remains for all eternity.
Isaiah 66:18-21
18 But I know their works and their thoughts. I am arriving, so that I may gather them together with all nations and languages. And they will approach, and they will see my glory.
19 And I will set a sign among them. And I will send some of those who will have been saved to the Gentiles in the sea, to Africa, and to those who draw the bow in Lydia, to Italy and Greece, to islands far away, to those who have not heard of me, and to those who have not seen my glory. And they will announce my glory to the Gentiles.
20 And they will lead all of your brothers from all of the Gentiles as a gift to the Lord, on horses, and in four-horse chariots, and on stretchers, and on mules, and in coaches, to my holy mountain Jerusalem, says the Lord, in the same manner that the sons of Israel would carry an offering in a pure vessel into the house of the Lord.
21 And I will take from them to be priests and Levites, says the Lord.