'Water of Life' in the Bible

And he said to me, I have become, I, the Alpha and the Omega, the beginning and the end. I will give to him who is thirsty of the fountain of the water of life freely.

And he showed me a pure river of water of life, bright as crystal, coming out from the throne of God and of the Lamb,

And the Spirit and the bride say, Come. And he who hears, let him say, Come. And he who is thirsty, let him come. He who desires, let him take the water of life freely.