Rev 22:2

2 in the midst of its street. On this side of the river and on that was the tree of life, bearing twelve kinds of fruits, yielding its fruit every month. The leaves of the tree were for the healing of the nations. 

the tree of life – of which God said “lest he reach out his hand and take also of the tree of life and live forever” (Gen 3:22). In Chapter 21, the words “It is done” signify the completion of God’s plan to make man in His image, from Gen 1:26. Man is granted the right to live forever.