Sefer Mitzvot Gadol

Moses ben Jacob of Coucy, also known as Moses Mikkotsi (Hebrew: משה בן יעקב מקוצי‎; Latin: Moses Kotsensis), was a French Tosafist and authority on Halakha (Jewish law). He is best known as author of one of the earliest codifications of Halakha, the Sefer Mitzvot Gadol.

Moses of Coucy lived in the first half of the thirteenth century. His name suggests he was born or raised in Coucy in Northern France. He was a descendant of a family of distinguished scholars. He was brother in law of Tosafist Shimshon of Sens and Shimshon of Coucy (HaSar MiCoucy).

He studied under Judah of Paris, and Yehudah HaChasid. Following in the latter's footsteps he traveled through Provence and Spain to strengthen religiosity among the Jews and teaching them the way to serve god.

In 1240 he was one of the four rabbis who were required to defend the Talmud, in a public disputation in Paris, and it is likely that the need for a work like the Sefer Mitzvot Gadol was driven by the decrees against the Talmud which had been promulgated in France, and had led to the confiscation and burning of all Talmud manuscripts in 1242.

The "Sefer Mitzvot Gadol" (ספר מצוות גדול; Hebrew: The Great Book of Commandments; abbreviated סמ"ג "SeMaG" ) deals with the 365 negative commandments and the 248 positive commandments, separately discussing each of them according to the Talmud and the decisions of the Rabbis. "SeMaG" also contains much non-legal, moralistic teaching. References to the "SeMaG" are by section (positive or negative commandments) and a number for each commandment within its section.

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