What evidence suggests that the Hebrew Bible was written and collected over a long period?

Evidence suggests that the Hebrew Bible was written and collected over a long period, as it did not emerge as a fixed, singular canon until well into the common era.12

Key indicators of this extended development include:

• Textual Divergence: The existence of multiple, varying text-forms for the same books—evidenced by the Samaritan Pentateuch, ancient versions, and the Dead Sea Scrolls—demonstrates that a standardized text was a relatively late development.12
• Oral Tradition: Many scholars believe portions of the literature underwent a long period of oral transmission, during which material was abridged, amplified, or altered before being committed to writing.1
• Canonical Fluidity: The division of the Bible into the Law, the Prophets, and the Writings reflects distinct stages of canonization. Historical evidence, such as the inclusion of different books in the Septuagint versus later rabbinic canons, indicates that the scope of sacred writings remained an unresolved question for centuries.2
• Scribal Activity: Rabbinic traditions describe extensive text-critical work by scribes (soferim) in the Second Temple period, including the use of "book correctors" and signs to mark suspect or disarranged verses, pointing to a long process of refining the text.13