Revelation 21:6

And he said unto me, They are come to pass I am the Alpha and the Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.

And he said unto me ... God continues to speak. Dummelow understood this as a reference to Revelation 21:5.[15] The creation of all things new is here referred to as a past event, by the prophetic tense, showing that it is as certain to happen as if it had already occurred.

I am the Alpha and the Omega, ... "As the book opens, so it closes, with the solemn assurance of the certainty and unchangeableness of God's eternal promises (Revelation 1:8)."[16]

I will give ... of the water of life ... Roberson compiled a list of the promises in Revelation to those who overcome:[17]

To eat of the tree of life (Revelation 2:7).

Not to be hurt of the second death (Revelation 2:11).

To eat of the hidden manna (Revelation 2:17).

To receive a white stone with a new name (Revelation 2:17).

To have authority over the nations (Revelation 2:26).

To receive the morning star (Revelation 2:26).

To be arrayed in white garments (Revelation 3:5).

Not to have his name blotted out of the book of life (Revelation 3:5).

To have his name confessed before God and the angels (Revelation 3:5).

To be made a pillar in the temple of God (Revelation 3:12).

To have a new name written upon him (Revelation 3:12).

To sit down with God in his throne (Revelation 3:21).

To drink the water of life freely (Revelation 21:7).

To be God's son and to have God for his God (Revelation 21:7).

[15] J. R. Dummelow, Commentary on the Holy Bible (New York: The Macmillan Company, 1937), p. 1090.

[16] A. Plummer, op. cit., p. 510.

[17] Charles H. Roberson. Studies in Revelation (Tyler, Texas: P. D. Wilmeth, P.O. Box 3305,1957), p. 200.