'Tree of Life' in the Bible

"'Let all who have ears give heed to what the Spirit is saying to the Churches. To him who overcomes I will give the privilege of eating the fruit of the Tree of Life, which is in the Paradise of God.'

On either side of the river, midway between it and the main street of the city, was the Tree of Life. It produced twelve kinds of fruit, yielding a fresh crop month by month, and the leaves of the tree served as medicine for the nations.

Blessed are those who wash their robes clean, that they may have a right to the Tree of Life, and may go through the gates into the city.

and that if any one takes away from the words of the book of this prophecy, God will take from him his share in the Tree of Life and in the holy city--the things described in this book.