1 Peter 1:4

4 to obtain an inheritance which is imperishable and undefiled and will not fade away, reserved in heaven for you,

In our living hope we have confidence in God that we will receive a great inheritance in heaven, which is imperishable (will not decay; it will last forever) and undefiled (will not be corrupted by evil) and will not fade away (like flowers that wither).

This inheritance is everything that belongs to our new life of glory—all the things that make us like Christ. We have some of those things now, like all the fruits of the Spirit. In heaven those things will be much more pronounced and free of corruption. We will also have a body that is perfect and will not age. And we will have great companionship with God and Christ and all the saints. And our rewards, of course, will be delightful.