'Water of Life' in the Bible

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

And he shewed me a pure river of the 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 thirsteth, Come. And let him, that desireth it, take the water of life freely.