Isaiah 66:21 (KJV)

Every enemy of the church shall be destroyed, and the final ruin of ungodly men shall be seenA prophetic declaration is given of the Lord's vengeance on all enemies of his church, especially that of all antichristian opposers of the gospel in the...

Exodus 19:6 And ye shall be unto me a kingdom of priests, and an holy nation. These are the words which thou shalt speak unto the children of Israel.
Isaiah 61:6 But ye shall be named the Priests of the LORD: men shall call you the Ministers of our God: ye shall eat the riches of the Gentiles, and in their glory shall ye boast yourselves.
1 Peter 2:9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
1 Peter 2:5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
Revelation 1:6 And hath made us kings and priests unto God and his Father; to him be glory and dominion for ever and ever. Amen.
Jeremiah 13:18–22 Say unto the king and to the queen, Humble yourselves, sit down: for your principalities shall come down, even the crown of your glory. …
Revelation 5:10 And hast made us unto our God kings and priests: and we shall reign on the earth.
Revelation 20:6 Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.

From OpenBible.info, most relevant first.

Church Prophecies concerning prosperity of Church
Gentiles Prophecies of the conversion of Gentiles
Israel, prophecies concerning Of blessing and restoration
Jesus, the Christ Prophecies concerning universality of the kingdom of Jesus, the Christ

Timeline of the Bible808–698 BC · Isaiah, in the days of Uzziah, Jotham, Ahaz, and Hezekiah

And I will also take וְגַם wĕgam Affirmation · with and מֵהֶם mēhem Preposition · with suffix: third person masculine plural אֶקַּח ʾeqqaḥ לָקַח Verb · qal imperfect, first person common singular
of them for priests לַכֹּהֲנִים lakkōhănîm כֹּהֵן Noun · masculine plural · with preposition with the
for Levites לַלְוִיִּם lalwiyyim לֵוִיִּי Noun · masculine plural · with preposition with the
saith אָמַר ʾāmar אָמַר Verb · qal perfect, third person masculine singular
the LORD יְהוָה yhwh יְהֹוָה Proper name

Isaiah 66:21 KJV