Paul babbled on about sacred secrets (wt bible) or mysteries. Here is the life after death mystery, although he fumbles this one too. He was copying/competing w the greek dionysian mysteries and the roman mithraic mysteries.
*** Rbi8 1 Corinthians 15:50-51 ***
. 51
Look! I tell YOU a sacred secret: We shall not all fall asleep [in death], but we shall all be changed,
Or, as the nrsv puts it:
51 Listen, I will tell you a mystery! We will not all die, but we will 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 will be changed.
53 For this perishable body must put on imperishability, and this mortal body must put on immortality.
SS