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Dig deeper and you will see where he preached from and it was no place called purgatory , he preached from paradise/Abraham's bosom.
Luk 16:19 There was a certain rich man, which was clothed in purple and fine linen, and fared sumptuously every day:
Luk 16:20 And there was a certain beggar named Lazarus, which was laid at his gate, full of sores,
Luk 16:21 And desiring to be fed with the crumbs which fell from the rich man's table: moreover the dogs came and licked his sores.
Luk 16:22 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;
Luk 16:23 And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
Luk 16:24 And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame.
Luk 16:25 But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented.
Luk 16:26 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.
Luk 16:27 Then he said, I pray thee therefore, father, that thou wouldest send him to my father's house:
Luk 16:28 For I have five brethren; that he may testify unto them, lest they also come into this place of torment. Luk 16:29 Abraham saith unto him, They have Moses and the prophets; let them hear them.
Luk 16:30 And he said, Nay, father Abraham: but if one went unto them from the dead, they will repent.
Luk 16:31 And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.

So where is Lazaras ? He is in Abraham's bosom (paradise)where he is comforted and where is the rich man ? He is in hell being tormented What else do we learn from this parable ? That there is a great distance between the two which one can not pass from one to another and yet those in hell can see and hear what is going on in Abraham's bosom (paradise).
So now we know where he preached from that Peter was talking about in 1Peter3:18-20 as you posted , he was not in hell he was in paradise with the thief on the cross like he told him he would be .
2Co 12:1 It is not expedient for me doubtless to glory. I will come to visions and revelations of the Lord. 2Co 12:2 I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth;) such an one caught up to the third heaven.
2Co 12:3 And I knew such a man, (whether in the body, or out of the body, I cannot tell: God knoweth;)
2Co 12:4 How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter.

See he tells us there is more than one level in heaven ...
Rev 2:7 He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God.

THis is exactly where he told the theif he would be with him at (in Paradise)

Joh 3:12 If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things? Joh 3:13 And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven. Joh 3:14 And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: Joh 3:15 That whosoever believeth in him should not perish, but have eternal life. Joh 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

Dig deaper ....

Is it heaven as in the throne room ? No Why ? The resurection of the dead has not happened yet and Jesus himself tells us that we need incorruptible bodies first.He said he was going to prepare a place for us and come back .
Joh 14:2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.

1Co 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed, 1Co 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. 1Co 15:53 For this corruptible must put on incorruption, and this mortal must put on immortality. 1Co 15:54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.

Read The Book of Revelation and you will see where the 24 Elders are at before the start of the great tribulation and they are then sitting in the Throne Room .
It's not a place where a church can pray you out of . Paradise is just that paradise a waiting place for him to come back and give them their incorruptible bodies . There is no such place as purgatory .

Nothing in the Bible is written so that you can go to one chapter and read and understand it's whole message . You must keep reading and dig deeper to get the whole message . If everything was written one so you could just pick out one chapter and read it and get the meaning than the enemy would have made sure to have someone remove that chapter . It contains everything we need to know but to know it we must keep reading and dig deeper