Here are two scriptures that describe the rapture:

1 Thessalonians 4:16-17:
For the Lord Himself will descend from heaven with a shout, with the voice of the archangel and with the trumpet of God, and the dead in Christ will rise first. Then we who are alive and remain will be caught up together with them in the clouds to meet the Lord in the air, and so we shall always be with the Lord.

1 Corinthians 15:51-52:
Behold, I tell you a mystery; we will not all sleep, but we will all be changed, in a moment, in the twinkling of an eye, at the last trumpet; for the trumpet will sound, and the dead will be raised imperishable, and we will be changed.

After the rapture God will pour out His wrath upon the earth so we do not want to be left behind. We must walk with the Lord, in the light of His Word.