'Tree of Life' in the Bible

He that hath an ear, let him hear what the Spirit saith to the churches. To him that overcometh, to him will I give to eat of the tree of life, which is in the Paradise of God.

in the midst of the street thereof. And on this side of the river and on that was the tree of life, bearing twelve manner of fruits, yielding its fruit every month: and the leaves of the tree were for the healing of the nations.

Blessed are they that wash their robes, that they may have the right to come to the tree of life, and may enter in by the gates into the city.

and if any man shall take away from the words of the book of this prophecy, God shall take away his part from the tree of life, and out of the holy city, which are written in this book.