Messiah will come again at the end of this age, and all nations will serve him forever.
According to the Tanakh Messsiah would come to give his life as an atoning sacrifice. About this coming of Messiah the Tanakh says that Messiah would come humbly and without outer glory. We even read that he would be despised and rejected:
For he grew up before him like a young plant and like a root out of dry ground; He had no form of majesty that we should look at him, he was despised and rejected by men… Isaiah 53:2-3 ESV
But the Tanakh also knows about a coming of Messiah with great glory. This means there are two comings of Messiah. We saw that after his atoning death Messiah would rise from the death to be exalted to the highest position possible. It is from this position he will come again:
And I saw in the night visions,
and behold with the clouds of heaven
there came one like a son of man
and he was presented before him.
And to him was given dominion and glory and a kingdom,
that all peoples, nations and languages should serve him;
his dominion is an everlasting dominion which shall not pass away,
and his kingdom one that shall not be destroyed.
Several times in the Tanakh G-d is said to come in a chariot of clouds (Psalm 18:11-12, 97:2, 104:3, Isaiah 19:1, Nahum 1:3); but now the Messiah comes from heaven with the same divine glory. He will come and receive his worldwide and everlasting dominion.
Great is the mystery of Israel’s Messiah. He is G-d and man at the same time. He gave himself as the perfect sacrifice for our sin before the second temple was destroyed. He is risen from the dead. He is now seated at the right hand of G-d as eternal king and priest. He comes again with the glory of heaven…
No wonder that Psalm 2 speaking of Messiah, pronounces:
Blessed are all who take refuge in him
But if Messiah came already in the first century CE are his atoning death and resurrection recorded? Actually the life of Messiah at his first coming is better documented than the life of any person in ancient history and of his atoning death and resurrection we have very reliable testimonies.