'Water of Life' in the Bible

Then He said to me, "These things have already happened. [Note: These words express the certainty of what has been predicted in this book, even though not all the events had actually taken place yet]. I am the Alpha and the Omega [See note at 1:8], the beginning and the end. I will give the person who is [spiritually] thirsty [a drink] from the spring of water of life without his having to pay for it.

Then the angel [See 21:9] showed me the river of the water of life. It was crystal-clear as it flowed out of the throne of God and the Lamb,

And the Holy Spirit and the bride [i.e., the church. See 21:9] say, "Come!" And the person who hears [this] should say "Come." And the person who is [spiritually] thirsty should come; [and] whoever wants to should come and drink the water of life without having to pay for it.