The Formation of the Biblical Canon: Volume 2: The New Testament: Its Authority and Canonicity

I'll do you even better and suggest better reading materials. For the deep dive, there's Lee MacDonald's Formation of the Biblical Canon. You can get Volume 1 here: https://a.co/d/05GI075J And volume 2 here: https://a.co/d/0fKEqzlP Or if you're looking for something a little lighter, the same author has a more popular level summary here: https://a.co/d/04HVQyZO