 It's an anonymous document. All three of them, or all four of them, are anonymous documents. It doesn't tell you who wrote the book, yet we know with certitude that the Apostle Matthew wrote that book, as did the names of the other apostolic writers who wrote the other books. We know that, but the Bible itself doesn't tell you that. It's an anonymous document. So why do you accept it? On what basis do you accept it? Well, it's there. It's in my Bible. It's the same Bible we've had for all these years, but you got it from the Catholic Church.