Did a medieval scholar secretly suggest Moses did not write the Torah?

Ideas & Philosophy · Published 29 September 2026 Swipe more like this →

In short: Abraham ibn Ezra was a wandering 12th-century polymath whose rationalist biblical commentaries quietly challenged traditional authorship. By pointing out geographical and historical anachronisms in the Pentateuch, he provided the intellectual foundation for Baruch Spinoza to later argue that the Torah was written long after Moses lived.

Born in Tudela around 1089, Abraham ibn Ezra spent three decades as a traveler, moving across Europe and reaching as far as Baghdad. Despite his reputation as a distinguished thinker, his most influential work began after 1140. Writing in Hebrew rather than the then-standard Judeo-Arabic, he produced a vast corpus covering grammar, scientific theory, and biblical exegesis. His approach was defined by a strict adherence to the literal sense of texts, explicitly rejecting the allegorical and Kabbalistic interpretations common among his contemporaries.

Ibn Ezra’s legacy is perhaps most controversial for his 'independent criticism' of the Torah. In his commentary on Deuteronomy, he highlighted specific passages—such as descriptions of Moses’s death or references to events occurring long after the Exodus—that seemed inconsistent with Mosaic authorship. He famously invited readers to 'grasp the mystery' behind these problematic verses. Centuries later, Baruch Spinoza cited these very observations in his Theologico-Political Treatise as evidence that the Pentateuch was a composite work redacted by someone living long after Moses.

Beyond theology, Ibn Ezra was a conduit for Islamic scientific knowledge. He published numerous works on astrology, the use of the astrolabe, and mathematics, with some scholars crediting him with introducing the Indo-Arab counting system to Europe before Fibonacci. His intellectual range was immense, spanning from the 1158 philosophical treatise Yesod Mora to his systematic astrological writings composed in Béziers in 1147–1148. While Orthodox interpretations maintain his work remains consistent with the tradition of divine dictation, his rationalist methodology undeniably paved the way for modern higher biblical criticism.

His influence extended to the structure of the Bible itself. He was among the first to propose that the Book of Isaiah was composed in two distinct historical periods, a division between chapters 1–39 and 40–66 that is widely accepted by modern scholars today. Whether viewed as a traditionalist or a pioneer of critical inquiry, Ibn Ezra remains a pivotal figure whose work bridged the gap between medieval faith and early modern rationalism.

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