1 Corinthians 15:20-23, 52-53

But in fact, Christ has been raised from the dead. He is the first of a great harvest of all who have died. So you see, just as death came into the world through a man, now the resurrection from the dead has begun through another man. Just as everyone dies because we all belong to Adam, everyone who belongs to Christ will be given new life. But there is an order to this resurrection: Christ was raised as the first of the harvest; then all who belong to Christ will be raised when he comes back.

It will happen in a moment, in the blink of an eye, when the last trumpet is blown. For when the trumpet sounds, those who have died will be raised to live forever. And we who are living will also be transformed. For our dying bodies must be transformed into bodies that will never die; our mortal bodies must be transformed into immortal bodies.