There is plenty, but I will use this:
And whosoever shall speak a word against the Son of man, it shall be forgiven him: but he that shall speak against the Holy Ghost, it shall not be forgiven him, neither in this world, nor in the world to come. (Matthew 12:32)
It is simply a matter of what is "the world to come." There is no longer any need for forgiveness in Heaven for all has already been forgiven, there is no possibility of forgiveness in Hell, so that means there must be a THIRD "world to come" where forgiveness is both still needed AND still available -- this is Purgatory.
So purgatory is implied scripturally?
LAZARUS found THAT out!