Without doubt both Habus and Badis permitted the Jewish vizir to exercise authority over the Jewish congregations of Granada, similar to that which Chasdaï and Ibn-Jau had possessed in Cordova. Samuel was named chief and prince (Nagid) of the Jews, and this title is used by Jewish authors. The minister of state was also the rabbi; he presided over the school, where he delivered lectures on the Talmud to his disciples. He gave judicial decisions on religious questions, and in fact completely filled the functions of a rabbi of the time. The same pen which wrote the decrees of the government was used for treatises and discourses on the Talmud. Samuel Nagid compiled a methodology of the Talmud (Mebo ha-Talmud), in which he clearly explained the technical expressions of the Talmud. As an introduction, he added a list of the bearers of tradition from the men of the Great Assembly through the successive authorities of the Tanaite, Amoraite, Saburaite, and Gaonic schools down to Moses and Chanoch, his teachers. He afterwards composed a commentary to the whole Talmud for religious practices, which was afterwards highly prized, and was recognized as the standard authority (Hilchetha Gabriatha). Samuel Ibn-Nagrela was also a neo-Hebraic poet, and employed both rhyme and meter skilfully. He composed prayers in the form of psalms, full of religious depth and submission, and called the collection the Young Psalter (Ben Tehillim). He wrote thoughtful aphorisms and parables, the fruit of his deep observation of men and manners, and called this composition the younger book of Proverbs (Ben Mishle). Last he compiled a book of philosophy modeled on that of the Preacher (Ben Kohelet). The latter, written when he had attained an advanced age, was the most successful of his works, and is full of deep thought and eloquence. He also composed epigrams and songs of praise, but his poetic compositions, both secular and spiritual, are heavy and dull, full of thought, but devoid of beauty of form. It became proverbial to say, "Cold as the snow of Hermon, or as the songs of the Levite Samuel."