What does the author say about the first resurrection that has already happened? (cf. Mt. 27:52)
Just to be sure, I'm not averse to people being premil.
The passage we're discussing in comparison with the short sentences in Mt 27 would be in Revelation -- keeping in mind that apocalyptic descriptions are notoriously hard to work with:
Then I saw thrones, and seated on them were those to whom the authority to judge was committed. Also I saw the souls of those who had been beheaded for the testimony of Jesus and for the word of God, and those who had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ for a thousand years. The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection. 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. Rev 20:4-6
In a premillenial view this occurs in the future, and so wouldn't have occurred yet.
In an amillenial view this has already occurred, and the First Resurrection was the Resurrection of Christ.
And Jesus cried out again with a loud voice and yielded up his spirit. And behold, the curtain of the temple was torn in two, from top to bottom. And the earth shook, and the rocks were split. The tombs also were opened. And many bodies of the saints who had fallen asleep were raised, and coming out of the tombs after his resurrection they went into the holy city and appeared to many. When the centurion and those who were with him, keeping watch over Jesus, saw the earthquake and what took place, they were filled with awe and said, "Truly this was the Son of God!" Mt 27:50-54
Then I saw thrones, and seated on them were those to whom the authority to judge was committed.
Jesus is presently enthroned, essentially taking on this authority to judge by His Crucifixion and Resurrection.
Also I saw the souls of those who had been beheaded for the testimony of Jesus and for the word of God, and those who had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ for a thousand years.
The resurrection of souls began with the Crucifixion and Resurrection of Christ, and some others at that time.
The rest of the dead did not come to life until the thousand years were ended.
There's a delay in the resurrection of others.
This is the first resurrection.
This would be the Resurrection of Christ.
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.
Those who share in the first resurrected are essentially believers and priests of God and Christ.