Purgatory

Catholics: There is an intermediate state or place called Purgatory where the dead go to suffer punishment until they can be purified. (Council of Florence, 1439) Made an official doctrine, though man began to teach the idea early as the sixth century.

...and...

These people have not fully made amends for their failings, so must atone for them by suffering before being admitted into heaven. These sufferings are lessened by prayers and masses, according to Council of Trent. (Fulton J. Sheen, World Book, "P", 803)

God's Word says:

Prayers of saints or others cannot change our destiny after death. Hebrews 9:27.

The righteous acts of others cannot be transferred to my credit (before or) after my decease. I must answer for my own acts of my own body. 2 Corinthians 5:10; Romans 1:29.

I cannot be saved by the prayers or righteous acts of others or even of my own self. Ephesians 2:8-9.

After death there is no changing from place of punishment to place of bliss. Luke 16:19-31.

The Bible knows nothing of indulgences either plenary or partial. Hebrews 2:3.

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Romans 16:16 1 Thess. 5:17 1 Thess. 5:22 1 Tim. 6:12 2 Tim 2:15