The first resurrection which occurs at the last trumpet
Immediately prior to the millennial reign.
1 Corinthians 15:52
English Standard Version
52 in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed.
Revelation 20:6
English Standard Version
6 Blessed and holy is the one who shares in the first resurrection! Over such the second death has no power, but they will be priests of God and of Christ, and they will reign with him for a thousand years.
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All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. ~Tolkien