Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places, 21. Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come: Eph 1:20-21

This reign fulfills the covenant promise that God would raise up Christ of the seed of David to sit upon David's throne, which is also the Lord's throne.

The LORD hath sworn in truth unto David; he will not turn from it; Of the fruit of thy body will I set upon thy throne. Psa 132:11

Also I will make him my firstborn, higher than the kings of the earth. Psa 89:27

compare with:

Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come: Eph 1:21

Then sat Solomon upon the throne of David his father; and his kingdom was established greatly. 1 Ki 2:12

compare with:

Then Solomon sat on the throne of the LORD as king instead of David his father, and prospered; and all Israel obeyed him. 1 Chr 29:23

To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne. Rev 3:21

Men and brethren, let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulchre is with us unto this day. 30. Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne; 31. He seeing this before spake of the resurrection of Christ, that his soul was not left in hell, neither his flesh did see corruption. 32. This Jesus hath God raised up, whereof we all are witnesses. 33. Therefore being by the right hand of God exalted, and having received of the Father the promise of the Holy Ghost, he hath shed forth this, which ye now see and hear. 34. For David is not ascended into the heavens: but he saith himself, The Lord said unto my Lord, Sit thou on my right hand, 35. Until I make thy foes thy footstool. 36. Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ. Acts 2:29-36

And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth; Rev 3:7

We further maintain that the promised kingdom of God was set up at the first coming of Christ and that the kingdom is the local church.

And in the days of these kings shall the God of heaven set up a kingdom, which shall never be destroyed: and the kingdom shall not be left to other people, but it shall break in pieces and consume all these kingdoms, and it shall stand for ever. Dan 2:44

But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you. Luke 11:20

The law and the prophets were until John: since that time the kingdom of God is preached, and every man presseth into it. Luke 16:16

And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it. 19. And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven. Mat 16:18-19

And I appoint unto you a kingdom, as my Father hath appointed unto me; 30. That ye may eat and drink at my table in my kingdom, and sit on thrones judging the twelve tribes of Israel. Luke 22:29-30

Unto the church of God which is at Corinth, to them that are sanctified in Christ Jesus, called to be saints, with all that in every place call upon the name of Jesus Christ our Lord, both theirs and ours: 1 Cor 1:2

Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord's table, and of the table of devils. 1 Cor 10:21

For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread: 24. And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. 25. After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me. 26. For as often as ye eat this bread, and drink this cup, ye do show the Lord's death till he come. 1 Cor 11:23-26

We further hold that the seed of Abraham (the Israel of God, the true Jews) are the children of God regardless of their natural race.

Know ye therefore that they which are of faith, the same are the children of Abraham. Gal 3:7

There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. 29. And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise. Gal 3:28-29

Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel: 7. Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called. 8. That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed. Rom 9:6-8

For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: 29. But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God. Rom 2:28-29