“He will be the most expert investigator of the Holy Scriptures who has first read all of them and has some knowledge of them, at least through reading them if not through understanding them. That is, he should read those that are said to be canonical…The whole canon of the Scriptures on which we say that this consideration of the step of knowledge should depend is contained in the following books: the five books of Moses, that is Genesis, Exodus, Leviticus, Numbers, and Deuteronomy; one book of Josue, one of Judges, one short book called Ruth which seems rather to pertain to the beginning of Kings; then the four books of Kings and two of Paralipomenon [Chronicles]….Job, Tobias, Esther, Judith, two books of Machabees, and two books of Esdras…Then there are the Prophets, among which are on book of the Psalms of David, and three books of Solomon: Proverbs, the Canticle of Canticles, and Ecclesiastes. For those two books, one of which is called Wisdom and the other Ecclesiasticus, are said to be Solomon’s through a certain similitude, since it is consistently said that they were written by Jesus son of Sirach. Nevertheless, since they have merited being received as authoritative, they are to be numbered among the prophetic books. The remainder are those books called Prophets in a strict sense, containing twelve single books of Prophets joined together. Since they have never been separated, they are thought of as one. The names of the Prophets are Osee, Joel, Amos, Abdias, Jonas, Micheas, Nahum, Habacuc, Sophonias, Aggeus, Zacharias, and Malachias. Then there are four books of four major Prophets: Isaias, Jermias, Daniel, Ezechiel. The authority of the Old Testament ends with these forty-four books.”
-St. Augustine in On Christian Doctrine, Book II, Chapt. 8.