Before reading this, we suggest reading the post on Revelation 1:8
Revelation 21:5 – He who sits on the throne said, “Behold, I make all things new.” He said, “Write, for these words are faithful and true.”
Revelation 21:6 – He said to me, “It is done! I am the Alpha and the Omega, the Beginning and the End. I will give freely to him who is thirsty from the spring of the water of life.
Revelation 21:7 – He who overcomes, I will give him these things. I will be his God [THEOS], and he will be my son.
If these are the words of Jesus, then Jesus could only be applying THEOS to himself in Revelation 21:7 as it was applied to him before became flesh (John 1:1), but similar to the way that the Hebrew word EL was applied to rulers in the Old Testament. (Ezekiel 32:21) Jesus, of course, will be the mighty ruler of the age to come, and in this sense the word THEOS could be applied to him, but not as the only true God. — John 17:3.
Nevertheless, I do not believe that John is quoting Jesus in the words of Revelation 21:5-7, but that he is quoting the angel who is quoting Yahweh. ‘He who sits on the throne’ in the book of Revelation is spoken of as the God of Jesus (Revelation 1:4; 2:7; 3:2,12), and is distinguished from the Lamb, representing Jesus. (Revelation 1:4,5; 5:1-7; 5:13, 6:16, 7:10,15) Applying this to the One sitting on the throne in Revelation 21:5 would mean that these words are the words of the God of Jesus, not Jesus himself, although they were delivered by Jesus to the angel who delivered them to John. (Revelation 1:1,2) Many, if not most, trinitarian Bible scholars acknowledge that the words of Revelation 1:5 are spoken by God the Father as distinguished from the Lamb, but some vaguely, and often without any reason for doing so, will claim that the one being quoted in verses 6 and/or 7 is Jesus. It should be apparent that the one being quoted in verses 5-7 are all the “one who sits on the throne”.
The words of Revelation 21:7 are not directed to the believers of this age, but to the world in the age to come, in the day of judgment and regeneration of the world, although indirectly they are applicable, since the believers in this age are reckoned, counted, imputed (Strong’s #3049) with the blessings and powers of the age to come, having received the spirit as a token, earnest, as first fruits, of that which is to come. –Romans 4; 6:11; 1 Corinthians 1:21,22; 5:17; 2 Corinthians 5:5; Ephesians 1:3-14; Hebrews 6:5; 12:23; James 1:18.
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The next in this series on Alpha and Omega deals with Revelation 22:13