Jesus is coming to gather the elect of God and take them off this earth to that new heaven and new earth which is created by God for the elect of God.
Jesus says: Mt. 24:29-31 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: 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. And HE (Jesus) shall send HIS angels with a great sound of a trumpet, and they shall gather together HIS elect from the four winds, from one end of heaven to the other.
The elect of God are those persons chosen by God for salvation. Those persons to whom God reveals HIMSELF. Those persons who are instantly changed by God into new creatures, not by their own will or by their own works, but by God's will.
This is explained in Romans 9 and Ephesians 1.
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