Purgatory (Lat., “purgare”, to make clean, to purify) in accordance with Catholic teaching is a place or condition of temporal punishment for those who, departing this life in God’s grace, are, not entirely free from venial faults, or have not fully paid the satisfaction due to their transgressions.
Further than this the definitions of the Church do not go, but the tradition of the Fathers and the Schoolmen must be consulted to explain the teachings of the councils, and to make clear the belief and the practices of the faithful.
newadvent.org/cathen/12575a.htm
The definition is a little confusing because it says place, but then a condition…perhaps in some way it is both??
It would seem to me to accept what the Bible teaches, which is absent from the body is to be home with the Lord for those He called.
Here is how the Holy Spirit put it via the apostles Paul:
Therefore, being always of good courage, and knowing that while we are at home in the body we are absent from the Lord-- for we walk by faith, not by sight-- we are of good courage, I say, and prefer rather to be absent from the body and to be at home with the Lord. Therefore we also have as our ambition, whether at home or absent, to be pleasing to Him.
I cannot find anything in the Bible that remotely resembles a place to be purified; but the Bible says that God can only rest in that which is Holy and He says we are holy and our bodies are the Lords temple for the Spirits dwelling place.
Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and that you are not your own? For you have been bought with a price: therefore glorify God in your body.
Seems that purgatory must have been something that came about over some period of time; most likely after 312ad. I don’t know; I don’t believe it exists.