Biblical support for Purgatory is well documented in various sites. I'm not sure that a further listing of them would be any further enlightening than it has been in the past.
By definition, Purgatory is a process, not a place. It is the process whereby one is cleansed before being admitted to Heaven. Therefore, souls undergoing Purgatory will enter the Kingdom of Heaven.
Well --- now that is enlightening. It's not a place. Then where does this "purgatorying" take place? In heaven or in hell or on earth or where???
As I've said before, the description of purgatory given by Catholic writers is "Hell with an exit pass". But what if you get there and the wardens don't honor that exit pass that your magisterium has issued to you???Your stay in that purgatorying place is then forever. And what do we all call that??? --- Hell.