'Water of Life' in the Bible

And he said to me, It is done. I am the First and the Last, the start and the end. I will freely give of the fountain of the water of life to him who is in need.

And I saw a river of water of life, clear as glass, coming out of the high seat of God and of the Lamb,

And the Spirit and the bride say, Come. And let him who gives ear, say, Come. And let him who is in need come; and let everyone desiring it take of the water of life freely.