1 Peter 1:4

The Father of immortality sent the immortal Son and Word into the world, who came to man in order to wash him with water and the Spirit; and He, begetting us again to in corruption of soul and body, breathed into us the breath (spirit) of life, and endued us with an incorruptible panoply. If, therefore, man has become immortal, he will also be God.

For God foresaw that the faith and behavior of people would be put right by the teaching of the gospel, and so he chose them in Christ before the foundation of the world, predestinating them to be his children by partaking of the Spirit of sonship. For foreknowledge means no more than seeing what is inside a person. It is now no longer foreknowledge in effect but knowledge of something real which has been foreseen. Those to whom Peter is writing were chosen according to foreknowledge, but the calling does not come to people who are hidden from view, for their innate awareness removes any doubt about their true nature.

In order to show how the inheritance of the blessed will continue forever, Peter calls it incorruptible and unfading, demonstrating by this that it is a pure and divine inheritance which will remain uncontaminated in the eyes of those who care nothing for their present wealth, knowing that they have something better and eternal waiting for them.

An incorruptible inheritance must be an infinite one, since everything finite is corruptible. The inheritance of the first Adam was corrupted by sin, but the inheritance of the second Adam can never be touched by the stain of sin.

In an incorruptible and undefiled inheritance, and that does not fade away, reserved in heaven for you
If there is an inheritance in heaven, the restoration of things is magnificent in a thousand years.

God has revealed the doctrine of truth, enjoined the path of good work and both promised and delivered the blessing of an inheritance that is always unfading and uncorrupted.

To an inheritance incorruptible, etc. Incorruptible, he says, because of the heavenly life, which is touched neither by age, nor disease, nor death, nor any sadness. Undefiled, because no impure person can enter into it. Unfading, because that heavenly life and conversation never come to seem worthless to the minds of the blessed, as the luxuries and delights of the present age often turn into disgust from prolonged custom and use.

Kept in heaven for you. Kept in you he says, instead of saying, kept for you, that is, kept now for this purpose, that it might be bestowed on you in heaven at the appointed time. Or certainly kept in heaven in you, because He who gave believers the power to become children of God (John 1), gave them the power to receive that inheritance in heaven, by persevering until the end to be saved. And therefore he says the inheritance is kept within those whom, with the Lord's help, he knows must arrive at it by their merits, because those who do not keep the discipline of the Father do not deserve to receive the inheritance from Him.

He blesses God, thanking Him for all the good things that He bestows. What does He bestow? Hope — not the kind that was through Moses, concerning settlement in the land of Canaan, which was mortal, but a living hope. From where does it have life? From the resurrection of Jesus Christ from the dead. For as He Himself rose, so also to those who come to Him through faith in Him He gives the power to rise as well. Thus, the gift is a living hope, an "incorruptible inheritance," not stored up on earth, as for example for the fathers, but in heaven, from which it also has the property of eternity, and in this it surpasses an earthly inheritance. Along with this hope there is yet another gift — the preservation and protection of the faithful. Because the Lord also prayed about this, when He said: "Holy Father, keep them" (John 17:11). "By power." What kind of power? — until the Lord's appearing. For if the preservation were not powerful, it would not have extended to such a limit. And when there are so many and such great gifts, it is natural for those who receive them to rejoice.

If the inheritance is in heaven, then the revelation of a millennial kingdom on earth is a lie.