Where does it say in the Bible about Jesus going into hell and preaching to the souls down there and taking the keys of death and hades away from Satan?
It sounds like someone has confused you with several unrelated scriptures. I will try to make them clear for you.
There is a rather difficult passage in 1 Peter 3:18-21, that is one of the passages you seem to be asking about. “For Christ also has suffered once for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but made alive by the Spirit; By which spirit he also went and preached unto the spirits in prison, which sometimes were disobedient, when once the patience of God waited in the days of Noah, while the ark was being prepared, in which ark few, that is eight, souls were saved by water, this prefiguring immersion which now saves us by the resurrection of Jesus Christ (not the putting away of dirt from the flesh, but the response of a good conscience toward God).” That long sentence says that, in some way, Jesus preached to disobedient spirits in Noah’s time. He calls them “spirits in prison,” but doesn’t say they were in hell. The most likely interpretation is that, through Noah, Jesus preached to those who were slaves to sin in Noah’s day, just as today he preaches through men to spirits imprisoned by sin. He is talking about living people, not people who have died and are in hell.
There is nothing in the Bible about Satan ever having had the keys of death and Hades. The keys of hell and death, and the key of the bottomless pit are all held in heaven (Revelation 1:18; 9:1; 20:1). In fact, Jesus said the “everlasting fire” was “prepared for the Devil and his angels.” (Matthew 25:41) If it was prepared for the Devil, it would make no sense for him ever to have had the keys. You don’t give the keys of a jail cell to the inmates. So Jesus has had the keys to death and Hades, at least since the beginning of the book of the Revelation, which would be at least since before his crucifixion.