Revelation 21:6

Revelation 21:6: “And he” [The Most High] “said unto me,” [John] “It is done. I am Alpha and Omega, the beginning and the end. I” [The Most High] “will give unto him" [Those in the seven churches in Asia] "that is athirst of the fountain of the water of life [Christ (The Holy Ghost/Spirit)] “freely.”

John 7:37-39

John 7:37: "In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink."

John 7:38: "He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water."

John 7:39: "(But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)"