21:4and He shall wipe away every tear from their eyes; and there shall no longer be any death; there shall no longer be any mourning, or crying, or pain; the first things have passed away."

the FIRST THINGS have passed away."

The FIRST THINGS, evil and sin, are gone (verse 1). Even before their downfall in Eden, Adam and Eve were still within "the FIRST THINGS". While they walked and talked with God, they still had the possibility of temptation and sin (Genesis 2:7,8,15-24). Now in the new earth and new heaven with the FIRST THINGS passed away, there is no possibility of evil or sin. We will be living in transformed spiritual bodies (1 Corinthians 15:35-57) that will inherit the imperishable.