Who Wrote the Old Testament?

From the Who Wrote the Bible? series

The Old Testament was composed by dozens of authors across roughly eight centuries. No single person wrote it, and no single century produced it. The 39 books of the Protestant Old Testament (or 24 books of the Hebrew Bible, counted differently but containing the same material) emerged from different kingdoms, different crises, and different literary traditions — and scholars have found that most individual books were themselves shaped by multiple hands over time.

Who wrote the Old Testament is, in a sense, the wrong question. The more accurate version: who kept writing it? Older materials were collected, edited, expanded, and reframed by later writers across centuries. The result is not a single composition but a layered library, spanning from the earliest prophetic oracles around 750 BCE to the Book of Daniel around 165 BCE.

The Torah: A Composite Foundation

The first five books — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — are traditionally attributed to Moses. Most scholars today conclude otherwise.

The landmark study was Julius Wellhausen’s Prolegomena to the History of Israel (1878), which synthesized earlier source analysis into the Documentary Hypothesis: four main literary traditions (J, E, D, and P) woven together by later editors. Each source reflects a different community, a different period, and a different set of theological concerns. Richard Elliott Friedman’s Who Wrote the Bible? (1987) brought this scholarship to a wide audience, demonstrating how the sources can be separated and read independently.

The Torah’s earliest material may date to the 10th or 9th century BCE. Its latest Priestly layers belong to the 6th or 5th century. Most scholars place the final compiled form in the Persian period, around 450-400 BCE.

That means the Torah’s composition spanned roughly five centuries.

For a detailed look at how source analysis works in practice — the visible seams, duplicated narratives, and shifts in divine names — see Who Wrote Genesis?, where the evidence is most concentrated. For the terminology and structure of the five-book collection itself, see Torah vs Pentateuch.

The Deuteronomistic History: Joshua Through Kings

The books of Joshua, Judges, 1-2 Samuel, and 1-2 Kings form what scholars call the Deuteronomistic History — a connected narrative running from the conquest of Canaan to the Babylonian exile in 586 BCE.

The name comes from Martin Noth. In 1943, he argued that a single editorial mind (or school) shaped these books using the theological framework of Deuteronomy: faithfulness to the covenant brings prosperity; unfaithfulness brings disaster. The editors drew on older sources — court records, royal annals, hero stories about individual judges, prophetic legends about Elijah and Elisha. The books themselves reference now-lost texts: the “Book of Jashar” (Joshua 10:13, 2 Samuel 1:18) and the “Book of the Acts of Solomon” (1 Kings 11:41).

Frank Moore Cross refined this picture in 1973. He proposed two major editions of the Deuteronomistic History.

The first, during King Josiah’s reign (~620 BCE), celebrated Josiah’s religious reforms and read Israelite history as building toward this moment of covenantal renewal. The second, produced during the Babylonian exile (~550 BCE), had to account for a catastrophe the first edition never anticipated: the destruction of Jerusalem, the end of the monarchy, the deportation of the population. The exilic editor reframed the entire narrative as a story of persistent covenant failure.

When you read about David’s rise to power or Solomon’s temple, you’re encountering older traditions filtered through the interpretive lens of editors writing centuries later — editors who already knew how the story ended.

The Prophetic Books: Oracles and Their Afterlives

The prophetic books present a different compositional pattern. Many are rooted in the words of identifiable historical figures: Amos, a sheep breeder from Tekoa active around 750 BCE; Hosea, a northern prophet roughly his contemporary; Jeremiah, active during the last decades of the Judean monarchy (~627-586 BCE).

But the books bearing their names are not transcripts.

The prophet spoke. Disciples collected the oracles. Later editors arranged, supplemented, and reinterpreted them for new audiences. The result, in most cases, is a text that contains an original prophetic voice surrounded by layers of editorial growth spanning generations.

Isaiah is the most striking example. Scholars since Bernhard Duhm’s work in 1892 have recognized that the 66 chapters span at least three distinct historical settings:

First Isaiah (chapters 1-39): largely from the 8th-century prophet Isaiah of Jerusalem, though even this section contains later additions
Second Isaiah (chapters 40-55): composed by an anonymous prophet during the Babylonian exile (~540 BCE), announcing return and restoration
Third Isaiah (chapters 56-66): post-exilic material from the early Persian period, addressing the returned community’s challenges

Three different authors. Three different centuries. The decision to preserve all three under a single book title was itself an editorial act — one that created a theological arc from judgment through exile to restoration.

The twelve shorter prophetic books (Hosea through Malachi) were eventually collected onto a single scroll, known as the “Book of the Twelve.” Scholars like James Nogalski have argued that this collection was deliberately arranged, with editorial additions creating verbal and thematic links between books that were originally independent compositions.

The Writings: Poetry, Wisdom, and Late Compositions

The third section of the Hebrew Bible — the Writings (Ketuvim) — is the most diverse. It also contains some of the latest compositions in the Old Testament.

Psalms is traditionally attributed to David. Scholars see something very different: an anthology spanning centuries of Israelite worship. Hermann Gunkel’s form-critical work in the early 20th century classified distinct psalm types — laments, hymns of praise, royal psalms, thanksgiving songs — each reflecting different liturgical settings and time periods. Individual psalms range from pre-monarchic compositions to post-exilic poetry. The five-book structure of the Psalter (Psalms 1-41, 42-72, 73-89, 90-106, 107-150) was probably finalized during the Persian period, but the material inside is far older.

Proverbs names its own multiple contributors. Proverbs 1:1 credits Solomon; 30:1 introduces “the words of Agur son of Jakeh”; 31:1 introduces “the words of King Lemuel.” The material spans the 10th through 5th centuries BCE — a curated wisdom tradition, not a single author’s work.

Ecclesiastes (Qoheleth) presents itself as the reflections of a king in Jerusalem. Its late Hebrew vocabulary and philosophical outlook place it in the 3rd century BCE, during the Hellenistic period when Greek thought was influencing Jewish intellectual life. The scholar Choon-Leong Seow dates it to the late Persian or early Hellenistic period based on its linguistic and economic references.

Daniel is set during the Babylonian exile (6th century BCE), but scholars date it to around 165 BCE — during the Maccabean crisis under Antiochus IV Epiphanes. The book’s “prophecies” accurately describe events up to that point but become vague afterward, the standard marker of vaticinium ex eventu (prophecy composed after the fact). Daniel is one of the last Old Testament books to reach its final form.

How Ancient Authorship Worked

“Authorship” in the ancient world operated differently than it does today.

Most Old Testament books were not produced by a single writer sitting down to compose a text from beginning to end. They emerged through collection, editing, supplementation, and compilation — processes that could span centuries. Scribes copied and transmitted texts, but they were not passive copyists. They added explanatory glosses, updated geographic names, inserted theological commentary, and occasionally combined separate traditions into a single narrative.

The scholar Michael Fishbane, in Biblical Interpretation in Ancient Israel (1985), documented how later biblical authors reinterpreted and revised earlier texts within the Bible itself. This process — what scholars call “inner-biblical exegesis” — means the Old Testament is a library in conversation with itself. Later books respond to, reframe, and sometimes correct earlier ones.

Christine Hayes, in her Yale Open Course on the Hebrew Bible, describes the editorial process as one where “the editors chose to preserve the tradition even at the cost of consistency.” Contradictions were retained. Competing accounts stood side by side. The result is a text with visible seams — and those seams are part of its history.

Reading with Composition in View

Knowing who composed the Old Testament — and when, and under what circumstances — opens each text in specific ways.

The prophetic books read differently when you know Amos was active during a period of Israelite economic prosperity and addressed his oracles to a wealthy class that assumed divine favor. The Deuteronomistic History reads differently when you recognize it as a work of exile theology, reinterpreting centuries of history through the lens of catastrophic loss. The Psalms read differently when you hear them as an anthology of worship spanning the full range of Israelite experience — from royal coronation hymns to the raw grief of exile.

The Old Testament is not one book with one perspective. It is a library assembled over eight centuries.

What changes when you read these texts in the order they were actually composed, with the historical context that illuminates why each was composed and who first heard it? Uncanon’s reading tracks present them that way — with scholarly framing before every passage, so you can see the layers for yourself.

Experience This Yourself

Uncanon presents the Bible in composition order with scholarly context before every passage — Setting the Scene, What Scholars Say, and Things to Notice — plus an AI guide you can ask questions at any point.

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Frequently Asked Questions

Did Moses write the Old Testament?

Moses is traditionally credited with the Torah (Genesis through Deuteronomy), but modern scholarship identifies multiple sources composed over centuries. The Torah reached its final edited form during the Persian period, roughly the 5th century BCE -- several centuries after Moses's traditional dates. The rest of the Old Testament was composed by dozens of other authors across an even longer span.

How many people wrote the Old Testament?

Scholars estimate dozens of authors contributed to the Old Testament over roughly 800 years, from the earliest prophetic oracles around 750 BCE to the Book of Daniel around 165 BCE. Many individual books also show evidence of multiple hands: editors, scribes, and redactors who shaped the texts across generations.

When was the Old Testament written?

The oldest texts in the Old Testament likely date to the 8th century BCE (the prophets Amos and Hosea), though some scholars argue that fragments of early poetry, such as the Song of Deborah in Judges 5, may be older. The most recent book, Daniel, was composed around 165 BCE. Most books were edited and compiled long after their initial composition.

What language was the Old Testament written in?

The Old Testament was primarily composed in Biblical Hebrew, with portions of Daniel (2:4-7:28) and Ezra (4:8-6:18, 7:12-26) in Aramaic. The Hebrew itself evolved over the eight centuries of composition, and linguists can often date texts by analyzing vocabulary, grammar, and syntax patterns.

What are the three sections of the Old Testament?

The Hebrew Bible is traditionally divided into three sections: Torah (the five books of Moses), Nevi'im (Prophets, including both historical and prophetic books), and Ketuvim (Writings, including Psalms, Proverbs, Job, Daniel, and others). This three-part structure, known as the Tanakh, reflects the order in which each section achieved authoritative status in Jewish tradition.