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The Treatise on the Left Emanation is a Kabbalistic text by Rabbi Isaac ha-Kohen, who with his brother Jacob traveled in Spain and Provence in the period of 1260–1280.

Scholars credit this text with being the first to present a "comprehensive concept of evil", bearing a striking resemblance to that found in Gnosticism. It is also the first to treat Samael and Lilith as a couple, likely inspiring later such depictions in the Zohar.

Isaac may be the pseudepigraphic author of other texts including the Pseudo-R. Eleazar Responsum, and the Pseudo-R. Yehushiel Responsa.

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