Catholic Bible vs. Protestant Bible: 73 vs. 66 Books Explained

The seven deuterocanonical books

The seven books included in Catholic Old Testaments and usually absent from Protestant Old Testaments are:

1. Tobit
2. Judith
3. Wisdom
4. Sirach, also called Ecclesiasticus
5. Baruch
6. 1 Maccabees
7. 2 Maccabees

Catholic editions also include additions to Esther and Daniel, such as the Prayer of Azariah and the Song of the Three Young Men, Susanna, and Bel and the Dragon. These are not additional books in the 73-book count; they are expanded portions of books already counted.

The books contain history, wisdom, prayer, moral instruction, and reflection on martyrdom and resurrection. The label “deuterocanonical” does not mean Catholics believe them to be second-rate Scripture. It describes the historical process by which their canonical reception became especially contested.

What was the Septuagint?

The Septuagint, often abbreviated LXX, is the ancient Greek translation of Jewish Scriptures produced over a long period for Greek-speaking Jewish communities. It became important throughout the Mediterranean world, including among Jews and Christians who did not read Hebrew or Aramaic fluently.

The New Testament frequently quotes or echoes the Greek form of Old Testament passages. This shows that the apostles and early Christians used the Septuagint's wording. It does not, by itself, prove that every book circulated with the Septuagint had exactly the same canonical status for every Jewish community. Ancient Jewish collections were diverse, and the boundaries of Scripture were not identical in every place.

For Catholic apologetics, the important point is that the Church did not inherit only one simple, universally closed Hebrew list and then accidentally add books later. The early Christian world received Scripture through several languages, communities, liturgies, and traditions. The longer Greek collection was an important part of that history.

Which Bible did Jesus and the apostles use?

Jesus and the apostles lived in a multilingual Jewish world. They knew the Hebrew Scriptures and engaged with Greek translations and oral interpretation. The Gospels and letters quote the Old Testament in forms that often resemble the Septuagint, but the New Testament does not give a formal list of all books in the Old Testament.

Therefore, the most accurate answer is not “Jesus carried a modern Catholic Bible with a printed table of contents.” It is that Jesus and the apostles used the Scriptures of Israel as received in their Jewish setting, and the first Christians inherited a rich, multilingual scriptural world. The Church later discerned the canon through apostolic worship, teaching, and historical recognition.

What about the Council of Jamnia?

Older apologetic arguments sometimes describe a Council of Jamnia around A.D. 90 as a single Jewish council that definitively removed the deuterocanonical books. Modern scholarship is more cautious. Evidence points to Jewish scholarly activity at Yavneh/Jamnia, but not to a universally documented council that settled the entire canon in one meeting.

The event occurred after the destruction of the Temple and after Christianity had begun to separate from many Jewish communities. It is reasonable to say that Jewish canon history and Christian canon history developed along different paths. It is not responsible to claim that a single anti-Christian meeting “removed” seven books from a previously universal Jewish Bible when the historical evidence is more complex.

Catholic claims do not depend on portraying Judaism as an enemy. The Church receives the Old Testament as part of Israel's Scriptures and should discuss Jewish history with respect. The question is which collection the Christian Church received and recognized, not whether a later community acted with bad motives.

How the early Church recognized its canon

Early Christian writers quote the deuterocanonical books and use them in teaching and worship, while lists of accepted books develop over time. Regional councils at Rome, Hippo, and Carthage are important evidence of the Western Church's canonical recognition. The process involved reception, liturgy, apostolic tradition, and the judgment of bishops—not a single political vote that created inspiration.

Different Eastern churches have their own canonical histories and may include books beyond the Catholic 73. A comparison between “Catholic” and “Protestant” should not pretend that those are the only two Christian canons. The page's 73-versus-66 comparison is useful for the common Western question, not a universal map of every Bible tradition.

What happened in the Reformation?

Martin Luther's German Bible placed the deuterocanonical books in a separate section called the Apocrypha and did not treat them as equal to the Old Testament books. Many Protestant editions later omitted them from the main Bible, and the 66-book arrangement became standard in much of Protestant Christianity. Luther also expressed strong doubts about some New Testament books, but Protestant communities did not all follow every one of his judgments.

It is therefore too simple to say “Luther alone removed the books” or to accuse every Protestant of personally deleting Scripture. The Reformation made a disputed canon a defining issue in Western Christianity, while the Catholic Church reaffirmed its 73-book canon at the Council of Trent in 1546. The historical disagreement involved theology, translation, inherited lists, and the authority used to settle disputes.

Why the difference matters

The deuterocanonical books contain passages that matter in Catholic theology. Second Maccabees 12 describes prayer and sacrifice for the dead, which connects with the Catholic doctrine of prayer for the departed and Purgatory. Wisdom reflects on the suffering righteous person in language Christians read in relation to Christ. Tobit explores providence, angels, marriage, and faithful prayer.

A Protestant reader can reject the books' canonical authority and still study them as valuable Jewish literature. A Catholic should not treat them as ammunition only. They belong to the Church's Scripture and should be read prayerfully, historically, and in the unity of the whole Bible.

Related prayers and guides

• Is Purgatory in the Bible?
• Is Sola Scriptura Biblical?
• Catholic Sacred Tradition
• RCIA Guide

Anti-thin-content test

• Clear reason to exist: explains the 73-versus-66 difference through lists, languages, canon history, Reformation context, and doctrine.
• Practical usefulness: answers which books differ, what the Septuagint was, what Jamnia was not, and why 2 Maccabees matters.
• Distinctive depth: avoids both “the Catholic Church added books” and “one Protestant removed everything” simplifications.
• Intent satisfied: a reader can compare canons and understand the history without being pushed into a caricature.