Yet another change the just post. The OT saints were not made perfect, they had to wait until Christ died, Hebrews 11:39-40. When we are set apart in Christ, we are made perfect, made alive, justified, regenerated, saved, made holy and blameless. When Christ comes again, we will be adopted (redeemed in glorified bodies.)
1Th 4:15
For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord, will not precede those who have fallen asleep.
1Th 4:16
For the Lord Himself will descend from heaven with a shout, with the voice of
the archangel and with the trumpet of God,
and the dead in Christ will rise first.
1Th 4:17
Then we who are alive and remain will be caught up together with them in the clouds to meet the Lord in the air, and so we shall always be with the Lord.
1Th 4:18
Therefore comfort one another with these words.