1 Thessalonians 4:16-18
16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
17 Then we which are alive [and] remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
18 Wherefore comfort one another with these words.
"Caught up together with them in the clouds, to meet the Lord in the air." When the gathering together takes place Christ does not come to the earth, we meet him in the air.
The gathering together is when Christ comes for his saints later he will come back with his saints, that is when he will come to the earth.