A. Grief: 13Now concerning those who are asleep, we do not want you to be uninformed, brothers and sisters, that you may not grieve as others do who have no hope.
B. The dead will come with him: 14For since we believe that Jesus died and rose again, even so, through Jesus, God will bring with him those who have fallen asleep.
C. The living will not precede the dead: 15For this we declare to you by a word from the Lord, that we who are alive, who are left until the coming of the Lord, will not precede those who have fallen asleep.
D. The coming of Jesus: 16For the Lord himself will descend from heaven with a cry of command, with the voice of an archangel, and with the sound of the trumpet of God.
C1. The dead will be raised before the living: And the dead in Christ will rise first. 17Then we who are alive, who are left, will be caught up together with them in the clouds to meet the Lord in the air,
B1. The living will be with him: and so we will always be with the Lord.
A1. Hope: 18Therefore encourage one another with these words.
Christian teaching 
Greatt post thank you