1. Christ will come again in the clouds and reign for ever and ever. (Dan 7:13-14)
    Mt 24:30, Mt 26:64, Mk 13:26, Mk 14:61-62, Lk 21:27, Rev 1:7, Rev 11:15

In the Old Testament, Daniel saw in a vision that God gave Christ, who came in the cloud, with all authority over the world. (Da 7:13-14)

Da 7:13 I saw in the night visions, and, behold, one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him.
14 And there was given him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed.

Christ will come on the clouds with power and great glory to reign for ever and ever. (Matthew 24:30, Matthew 26:64, Mark 13:26, Mark 14:61-62, Luke 21:27, Revelation 1:7, Revelation 11:15)

Matthew 24:30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.

Matthew 26:64 Jesus saith unto him, Thou hast said: nevertheless I say unto you, Hereafter shall ye see the Son of man sitting on the right hand of power, and coming in the clouds of heaven.

Mark 13:26 And then shall they see the Son of man coming in the clouds with great power and glory.

Mark 14:61 But he held his peace, and answered nothing. Again the high priest asked him, and said unto him, Art thou the Christ, the Son of the Blessed?
62 And Jesus said, I am: and ye shall see the Son of man sitting on the right hand of power, and coming in the clouds of heaven.

Luke 21:27 And then shall they see the Son of man coming in a cloud with power and great glory.

Revelation 1:7 Behold, he cometh with clouds; and every eye shall see him, and they also which pierced him: and all kindreds of the earth shall wail because of him. Even so, Amen.

Revelation 11:15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever.