Treatise on the Left Emanation

The Treatise on the Left Emanation (מאמר על האצילות השמאלית) is a Kabbalistic text by Rabbi Isaac ben Jacob ha-Cohen, 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''.

Translation

 * Professor Ronald C. Kiener, published an incomplete translation in The Early Kabbalah, New York: Paulist Press, 1986.
 * A complete translation from Hebrew to English has been published in 2023.