1 Corinthians 15:20 Revised Standard Version (RSV)
20 But in fact Christ has been raised from the dead, the first fruits of those who have fallen asleep.
1 Corinthians 15:51-57 Revised Standard Version (RSV)
51 Lo! I tell you a mystery. We shall not all sleep, but we shall all be changed, 52 in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed. 53 For this perishable nature must put on the imperishable, and this mortal nature must put on immortality. 54 When the perishable puts on the imperishable, and the mortal puts on immortality, then shall come to pass the saying that is written:
“Death is swallowed up in victory.”
56 The sting of death is sin, and the power of sin is the law. 57 But thanks be to God, who gives us the victory through our Lord Jesus Christ.