1 Thessalonians 4:13; 1 Thessalonians 4:15
And regarding the question, friends, that has come up about what happens to those already dead and buried, we don't want you in the dark any longer. First off, you must not carry on over them like people who have nothing to look forward to, as if the grave were the last word.
And then this: We can tell you with complete confidence - we have the Master's word on it - that when the Master comes again to get us, those of us who are still alive will not get a jump on the dead and leave them behind. In actual fact, they'll be ahead of us.