Dates: c. AD 60–90 · Wikipedia
Summary: The New Testament supplies the data the later geography is built on: a conscious
post-mortem existence, two destinies separated by an impassable gulf (Luke 16), and the believer "with
Christ" / "in paradise" immediately at death (Luke 23; 2 Cor 5; Phil 1). All quotations are KJV.
And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried; And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
— Luke 16:22–23 (KJV), historicalchristian.faith. Both men are conscious after death and before the resurrection: Lazarus comforted in "Abraham's bosom," the rich man "in hell" (Gk. Hades) "in torments." This is the locus classicus for the two-compartment intermediate state.
And beside all this, between us and you there is a great gulf fixed: so that they which would pass from hence to you cannot; neither can they pass to us, that would come from thence.
— Luke 16:26 (KJV), historicalchristian.faith. The two divisions of the dead are permanently separated by a "great gulf fixed" — the impassable barrier that the structured-Hades tradition (already in 1 Enoch 22) places between the righteous and the sinners.
And Jesus said unto him, Verily I say unto thee, To day shalt thou be with me in paradise.
— Luke 23:43 (KJV), historicalchristian.faith. Christ promises the penitent thief immediate ("to day") presence with him in "paradise" — naming the blessed compartment of the intermediate state and dating entry into it to the moment of death.
We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord.
— 2 Corinthians 5:8 (KJV), historicalchristian.faith. Paul treats death (absence "from the body") as immediate presence "with the Lord," not unconsciousness or extinction — a conscious intermediate state for the believer.
For I am in a strait betwixt two, having a desire to depart, and to be with Christ; which is far better.
— Philippians 1:23 (KJV), historicalchristian.faith. Paul expects that to "depart" (die) is at once "to be with Christ," and that this state is "far better" than continued earthly life — again a conscious, blessed condition before the resurrection.