Thus, Hillel called attention to seven commonly used hermeneutical principles in the interpretation of laws ( baraita at the beginning of Sifra ); R. Ishmael , thirteen (baraita at the beginning of Sifra; this collection is largely an amplification of that of Hillel).  Eliezer b. Jose ha-Gelili listed 32, largely used for the exegesis of narrative elements of Torah. All the hermeneutic rules scattered through the Talmudim and Midrashim have been collected by Malbim in Ayyelet ha-Shachar , the introduction to his commentary on the Sifra . Nevertheless, R. Ishmael's 13 principles are perhaps the ones most widely known; they constitute an important, and one of Judaism's earliest, contributions to logic , hermeneutics , and jurisprudence .  Judah Hadassi incorporated Ishmael's principles into Karaite Judaism in the 12th century.  Today R. Ishmael's 13 principles are incorporated into the Jewish prayer book to be read by observant Jews on a daily basis.