I agree that whosoever has part in the first resurrection have overcome the second death, but they will not become immortal until their bodies are physically resurrected and changed physically from mortal to immortal, and corruptible to incorruptible human bodies. Immortal and incorruptible bodies enable them to live forever with Christ on the new earth. Physical death is not swallowed up in victory until our physical bodies are given immortal and incorruptible life. At the same hour the saints are physically resurrected and changed, those who have not part in the first resurrection are also physically resurrected to damnation of the second death (LOF).
1 Corinthians 15:51-54 (KJV) Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed, In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal must put on immortality. So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
Revelation 10:5-7 (KJV) And the angel which I saw stand upon the sea and upon the earth lifted up his hand to heaven, And sware by him that liveth for ever and ever, who created heaven, and the things that therein are, and the earth, and the things that therein are, and the sea, and the things which are therein, that there should be time no longer: But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.
John 5:28-29 (KJV) Marvel not at this: for the hour is coming, in the which all that are in the graves shall hear his voice, And shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto the resurrection of damnation.
The 144,000 redeemed from the earth are Old Covenant faithful of all the tribes of the children of Israel. We first read of them in Rev 7 being sealed by the Holy Spirit. In life they died in faith, believing the prophets words of the Messiah who would come to redeem them from death. But they died before Christ came and sent His Spirit who gives us eternal spiritual life that makes it possible for us to ascend to heaven after death spiritually alive as living souls.
Revelation 7:4 (KJV) And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel.
Having first been sealed with eternal spiritual life from the Holy Spirit, we next read of them in heaven, where they will remain until the seventh angel begins to sound that time shall be no more. Then their bodies will be physically resurrected from the grave and changed from mortal to immortal and corruptible to incorruptible, and reunited with our eternal spirit that comes with Christ when He returns the second time. Then we will once again be as we were in the beginning when God created mankind and everything was "very good".
We know the 144,000 are of all the tribes of the children of Israel of old because they are called "firstfruits unto God and the Lamb". Firstfruits meaning the first to be spiritually resurrected to ascend spiritually to heaven with Christ after His resurrection. This too proves how Christ defeated Satan by going into the abode of the dead and taking those held captive to death, now spiritually alive with Him to heaven.
Ephesians 4:8-10 (KJV) Wherefore he saith, When he ascended up on high, he led captivity captive, and gave gifts unto men. (Now that he ascended, what is it but that he also descended first into the lower parts of the earth? He that descended is the same also that ascended up far above all heavens, that he might fill all things.)
The first resurrection we must all partake of is the resurrection of Christ. That means to be born again, born from above. Having spiritual life when we were once spiritually dead in trespasses and sins is to have part in the first resurrection. Only those of the first resurrection through Christ will attain immortal and incorruptible physical life after the seventh angel begins to sound that time shall be no more.
