His precepts are simply the records of his practice.
The idea of this immense collection of ethical and moral precepts was first suggested to the poet by his favourite disciple Hasan, better known as Husam-uddin, who in 1258 became Jalal-uddin's chief assistant.
On the other hand, his example in manumitting most of his slaves, together with the precepts of the church, practically put an end to slavery in the course of the 13th century, the slaves becoming for the most part serfs, who differed from the free peasants only in the fact that they were attached to the soil (adscripti glebae).
His first works, Theorie des lois criminelles (1781) and Bibliotheque philosophique du legislateur (1782), were on the philosophy of law, and showed how thoroughly Brissot was imbued with the ethical precepts of Rousseau.
Of the same school were Menahem ben Simeon of Posquieres, a commentator, who died about the end of the 12th century, and Moses ben Jacob of Coucy (13th century), author of the Semag (book of precepts, positive and negative) a very popular and valuable halakhic work.