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With Christ's death and resurrection, several things changed. Upon His death, His soul, like everyone else's, was taken by the Devil to Sheol/Hades. But both His body and His soul are united to His divinity. So in Sheol, He revealed His divinity, took the Devil captive, and preached to those imprisoned there (
1 Pt 3:19 ). He tnen rescued the righteous souls, an event which was glimpsed by some living people (
Matthew 27:51-53 ). He took those souls to Paradise, which is now once again accessible (
Luke 23:43 ). Then, of course, He rose from the dead to give us a chance to enter Paradise as well. Paradise, like Sheol/Hades, is "somewhere" within God's uncreated Glory/Grace/Energy.
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At Christ's Second Coming, the dead, both saints and sinners, shall be resurrected. (
1 Th 4:16-17 ). BTW, in this passage, death and Sheol/Hades/ are both listed, which means that they are not the same thing.
After the resurrection comes the Last Judgement (
Rev 20:12-13 ).
Then God's Uncreated Divine Glory/Grace/Energy will subsume the Heavens, Paradise, the Earth, and Sheol/Hades, to become all in all (
1 Cor 15:24-28;
Rev 20:9-21:27 ).
To the righteous, this will be experienced as new Heavens, Earth, and Jerusalem (
Rev 21 ).
To sinners, this will be experienced as a Lake of Fire. (
Rev 20:15 ).
In Christ's parables, the future Lake of Fire is symbolized by "
Gehenna". This refers to the
Valley of Hinnom, near Jerusalem. It served as the city's garbage dump. In the middle, a constant bonfire was kept, and people dumped their garbage there to be burned.
"Gehenna" is translated in the KJV as:
"hell" 9 times. (
link ).
"hellfire" 3 times. (
link ).
But when an object is burned, it doesn't completely disappear. There are ashes. So, when a sinner goes to the Lake of Fire, his sins are burned up, but his soul remains. (
Mat 9:43-48 ).