'Water of Life' in the Bible

Then he said, "All is over! I am the alpha and the omega, the First and the Last. I will let the thirsty drink of the fountain of the water of Life without price.

Then he showed me the river of the water of Life, bright as crystal, flowing from the throne of God and of the Lamb

"Come," say the Spirit and the Bride: let the hearer too say, "Come"; and let the thirsty come, let anyone who desires it, take the water of Life without price.