Ps 110:1-2, Lk 1:31-33, Mt 3:16-17, Mt 21:9, Eph 1:20-21, Phil 2:8-11

In the Old Testament, Solomon prayed to God to fulfill what God had promised to King David in his future generations. (2 Chron 6:16)

2 Chron 6:16 Now therefore, O Lord God of Israel, keep with thy servant David my father that which thou hast promised him, saying, There shall not fail thee a man in my sight to sit upon the throne of Israel; yet so that thy children take heed to their way to walk in my law, as thou hast walked before me.

In the Old Testament, David saw God granting Christ eternal kingship. (Psalm 110:1-2)

Psalm 110:1 The Lord said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool. 2 The Lord shall send the rod of thy strength out of Zion: rule thou in the midst of thine enemies.

An angel prophesied that Jesus would be born and that he would receive the kingship of David forever. (Luke 1:31-33)

Luke 1:31 And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name Jesus.

32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David:

33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end.

When Jesus entered Jerusalem, many Israelis welcomed Jesus as the eternal king of David. (Mt 21:9)

Mt 21:9 And the multitudes that went before, and that followed, cried, saying, Hosanna to the son of David: Blessed is he that cometh in the name of the Lord; Hosanna in the highest.

God raised Jesus from the dead and gave him eternal throne. (Ephesians 1:20-21, Phil 2:8-11)

Ephesians 1:20 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:

Phil 2:8 And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross. 9 Wherefore God also hath highly exalted him, and given him a name which is above every name: 10 That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth; 11 And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.