1 Thessalonians 4:13; 1 Thessalonians 4:15

13 And now, brothers and sisters, I want you to know what will happen to the Christians who have died so you will not be full of sorrow like people who have no hope.
15 I can tell you this directly from the Lord: We who are still living when the Lord returns will not rise to meet him ahead of those who are in their graves.