'Water of Life' in the Bible

And he said to me, All things are accomplished. I am the Alpha and the Omega, the beginning and the end. To him that thirsteth I will give of the fountain of the water of life freely.

And he showed me a river of water of life, clear as crystal, coming 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! Whoever will, let him take the water of life freely.