In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.
And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.
… 
17 And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely.