Bear with me and Scripture here.
In Fact, JESUS is the First Resurrection and the First Resurrection takes Place in HIM = "FIRST and LAST".
Now before we look at all the Scripture that clearly states this, i want everyone to know that the ANSWER is in this Post.
That is not what they are saying.
They are saying Jesus is the first resurrection in Revelation 20:5-6.
That resurrection is physical.
Jesus is not the physical resurrection.
Jesus is the Resurrection and the Life. Jesus is the Word. Jesus is not the verse on the page or in the post. Our Bibles are copies of the Word. Jesus is the Word.
Our physical resurrection is a copy of Jesus' being the Resurrection and the Life.
The first resurrection is physical just like the first birth is physical and the first death is physical. The resurrection in Revelation 20:4-6 is not even the chronological first in that chapter. It is the physical resurrection to a physical body. Not a mortal body, which is dead. Not even to an immortal body, which is Satan's Greek mythology.
It is to a permanent incorruptible physical body, ie the heavenly body which is from above ie spiritual, but not the spirit, only the physical. It is only termed spiritual in regards to being of God. The spirit is the third part of who we are, but not the breath or air of life, that is also the Greek term for spirit. Our spirit is not air. Air is part of creation that is figuratively used to describe the Holy Spirit, but the Holy Spirit is not air. We are not air beings. We are spirit beings, the image of God within creation. Adam before disobedience, could communicate with God quite freely in the spirit. Adam had a spirit that allowed direct communication with God. It was not air.
The spirit is not even directly mentioned much in the OT, because the OT started with Moses and there was only word of mouth until Moses set the record straight, getting it directly from God on mount Sinai. It was brought up in the prophets. It was pointed out in the book of Kings. But Adam lost all ability to communicate with the spirit, and God literally forbade any human from even attempting to communicate in the spirit part of creation. Demons are human spirits that could no longer remain in the presence of God, because the human had become reprobate. The condition of life in Noah's day was total reprobation. That is why God wiped out both Adam's flesh and the sons of God created on the 6th day who became like Adam and was disobedient to God. I don't think it was the first generation, but many generations removed who became entagled in Adam's dead corruptible flesh.
The sons of God were removed and became the opposition to the demonic forces at play in the spiritual. They were still placed over the affairs of humans according to Job.
But the whole point of Jesus being the Resurrection and the Life was to restore Adam's dead corruptible flesh back into being a son of God.
Jesus was the first and only begotten son. All the rest were created. We in Adam's image were left on earth so that the many could be redeemed. Many generations of Adam's flesh and blood.
The main reason God reserved the last 1,000 years for His glory was to allow earth to end like it started. The reason why procreation does not happen in Paradise is because that was already accomplished on earth. Procreation will continue on earth as normal. That first resurrection generation will rule over their offspring for a 1000 years, and never stop living. Just like Adam would have in the original Garden, had he not disobeyed God. BTW I think Adam Disobeyed after 30 years of being in the Garden. Jesus was obedient to God in baptism at 30 years of age. Adam was not 30 years old. I think Adam was created on the 6th day. The Day of the Lord we call the Sabbath or "7th" day was also a millennium.
No one agrees with me that God had a thousand years without sin prior to Adam being placed in the Garden, but no one else has a Scriptural reason to point out the age of the earth either, and why it looks older than it is. There was literally 1,000 years where no trees, nor any plants that produce seeds ever died, nor even sprang to life. All the original trees and plants stayed the same for 1,000 years. That is literally what Genesis 2 states. Nothing died. Nothing wild came out of the ground. Nothing was planted. Humans and animals literally survived on fruit and seeds, and there was not even any waste.
"And every plant of the field before it was in the earth, and every herb of the field before it grew: for the Lord God had not caused it to rain upon the earth, and there was not a man to till the ground."
"And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat. And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so."
Every last fruit and seed was accounted for as the diet of all that lived on the earth. Many generations for 1,000 years, all eating from the original trees and plants. There was literally no death period.
Then God planted a garden, and placed a man in that Garden and called that man, man. That is what Adam means. hā·’ā·ḏām Mankind is Adamkind.
The first man was created, the second man, Christ was the begotten human son of God.
And there won't be any mortal which literally means death living in the Millennium. Because nothing will die naturally just like the first 1,000 years. Death will exist, but those who die will be considered cursed. One can still disobey like Adam could disobey. The result will not bring sin into the world like what Adam did. Disobedience is instant death and placement in Death. No redemption and only the LOF as the end result for the one who disobeyed.