1 Corinthians 15:51, " Behold i  tell you a mystery: We shall not all sleep, But we shall 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 incorruptible, and we shall be changed. Then I would like you to read , 1 Thessalonians 4:13 - 5:9   4:13 " to be caught up = Rapture.  The rapture is a mystery but the 2 part of of coming break in.