||Only edition of these halakhic novellae on the Talmud and the Rif (Alfasi) by R. Aryeh Leib ben Shalom Shaknah Yellin. The title-page describes Mitzpeh Aryeh as halakhic subject matter going after the source in the Talmud and poskim and the Hilkhot ha-RifHe has called it Mei Be’ir באר (the water of the wells, Numbers 20:17, 21:21:22) for it comes to explain לבאר every din according to the conclusions of the ahronim (later sages). The title-page also informs that Mitzpeh Aryeh is accompanied by Kol Aryeh, discourses. There is an introduction from R. Yellin and then the text.
R. Aryeh Leib ben Shalom Shaknah Yellin (1820-86) was rabbi of Bielsk Podlaski, Poland. He was one of the most prominent Polish rabbis, to whom halakic matters were frequently referred for decision. He was the author of Kol Aryeh and Miẓpeh Aryeh, novellæ on various Talmudical tractates. His most important production is the Yefeh 'Enayim, (trans.: "beautiful eyes") giving the parallel passages found in the Babylonian Talmud, the Yerushalmi, the Midrashim, the Pesichtas, and other ancient rabbinic productions, occasionally with critical remarks which are of the greatest value to the rabbinic student. The Yefeh 'Enayim accompanies the Talmudic text in the new Talmud editions of the Romms of Wilna. Yellin left in manuscript many novellæ on the Talmud and a collection of responsa.