An example:
They Teach A Person Is Saved By Works
In the Apocrypha proof texts can be found to support the Roman Catholic doctrine of justification by human works and not faith alone. The Apocrypha contains the following verses.
For almsgiving saves from death and purges away every sin. Those who give alms will enjoy a full life (Tobit 12:9).
In another place in Tobit it says.
So now, my children see what almsgiving accomplishes, and what injustice does it brings death! (Tobit 14:11).
In the Book of First Maccabees it says.
Was not Abraham found faithful when tested, and it was reckoned to him as righteousness (First Maccabees 2:52).
The Bible, on the other hand, says that a person is saved by grace through faith. It is not based upon our good works.
For by grace you are saved through faith, and this is not your own doing; it is the gift of God - not the result of works, so that no one may boast (Ephesians 2:8,9).
https://www.blueletterbible.org/faq/don_stewart/don_stewart_395.cfm
The question is: Who had the authority to reject anything as canon after they had been part of the Christian canon for 1000 years before Luther?