Sefer HaAgur is a 15th-century halakhic digest by Rabbi Jacob Landau, covering topics addressed in the Orach Chaim and Yoreh Deah sections of Rabbi Jacob ben Asher’s Tur. In his introduction, Landau writes that he wrote his book for his student, who was busy studying physics and metaphysics and did not have time to study Jewish law from its talmudic sources. Based primarily on the Tur, Sefer HaAgur presents a summary of existing opinions for each given law, a legal ruling, and a summary of the questions and cases raised in recent halakhic literature since the publication of the Tur. Sefer HaAgur was novel in its occasional incorporation of kabbalistic considerations into halakhic rulings. It was also the first published Hebrew book to contain *haskamot,” approbations from other rabbis.