'Water of Life' in the Bible

And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.

And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.

And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely.