'Water of Life' in the Bible

And he said to me, It is done. I am the Alpha and the 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 clear river of water of life, bright 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 who is athirst come: and whosoever is desirous, let him take of the water of life freely.