With respect to the body
“I tell you this, brothers: flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.”
1 Corinthians 15:50
A human is a triad. The body is the housing. The housing is dynamic, it has preferences but is also corrupted by sin, making it perishable and therefore mortal. Sin exists because of the law or the knowledge of good and evil.
“The sting of death is sin, and the power of sin is the law.”
1 Corinthians 15:56
Paul, the sent one, writes about the body/flesh being under the power of sin
“For we know that the law is spiritual, but I am of the flesh, sold under sin.”
Romans 7:14
This body awaits transformation, in its current form it will not be saved.
“And not only the creation, but we ourselves, who have the firstfruits of the Spirit, groan inwardly as we wait eagerly for adoption as sons, the redemption of our bodies.”
Romans 8:23
απολυτρωσιν - The bodies must be, in English, redeemed, or receive deliverance (from sin and mortality). They essentially are replaced, changed, engulfed by the new bodies
With respect to the soul
“Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.”
Romans 12:2
The soul which is further qualified as the will, mind and emotion, all immaterial but intricately connected to the body, is in the process of being saved. Regenerated.
With respect to the spirit of man
“No one born of God makes a practice of sinning, for God’s seed abides in him; and he cannot keep on sinning, because he has been born of God.”
1 John 3:9
The seed is the Word of God. To be born of God is to be a new spirit, John 3:6. This part of man doesn’t need saving because it cannot sin. It is of God.
“Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come.”
2 Corinthians 5:17
With respect to passing through the final gate
In order to continue on in the kingdom to come, humans will need all three, a new body, a transformed soul and their new spirit.