"But we do not want you to be uninformed, brethren, about those who are asleep, that you may not grieve, as do the rest who have no hope. For if we believe that Jesus died and rose again, even so God will bring with Him those who have fallen alseep in Jesus. For this we say to you by the word of the Lord, that we who are alive, and remain until the coming of the Lord, shall not precede those who have fallen asleep. 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 shall rise first. Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air, and thus we shall always be with the Lord. Therefore comfort one another with these words."
1 Thesslonians 4:13 - 18