Not to get too indept until I have time to go back look over some things. The Old Testament believer was saved by faith through Grace. Abrahams faith was counted unto him for righteousness we are told.
From the Lord's own lips we were told of Abaham's busom. The saviour they looked for came. Ephesians 4: 9"(Now that he ascended, what is it but that he also descended first into the lower parts of the earth?
10He that descended is the same also that ascended up far above all heavens, that he might fill all things.)"
Paul said the Lord first descended. Peter also tells us He did.
1 Peter 3:
18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19 By which also he went and preached unto the spirits in prison;
20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
So when did He preach to the spirits in prison, when he descended during his time in the grave.
Christ took those souls in Paradise to heaven, when He had accomplished the work for their salvation.
Ephesians 3:14For this cause I bow my knees unto the Father of our Lord Jesus Christ,
15Of whom the whole family in heaven and earth is named,
16That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man;
Talks of the whole family in heaven, not in paradise. So with His death He descended inot Paradise and took those souls to heaven. I have more on this I believe just need to get home and to it.