Halakhah su Levitico 11:1

Despite the great reluctance of the talmudic Sages to offer a rationale for the fundamentals of kashrut, others were not similarly reticent. The interpretations which have been advanced over the course of centuries are varied and sundry. The explanation which has probably enjoyed the widest circulation is the one which sees a connection between these laws and physical health and well-being. This concept gained currency in the days of antiquity: it is expressed in the Pseudepigrapha¹IV Macc. 5:25–27. and alluded to in the works of Philo.²De Specialibus Legibus, IV, 119. Translated by F. H. Colson (Cambridge, 1939), VIII, 81. Although these writings are not necessarily indicative of rabbinic thought, similar concepts are expressed by Maimonides,³Guide of the Perplexed, III, chap. 48. Nachmanides,⁴Commentary on the Bible, Lev. 11:43. Gersonides,⁵Commentary on the Bible, Parshat Ekev, To‘elet 26. and others.⁶Abraham ibn Ezra, Commentary on the Bible, Exod. 22:30; Rashbam, Commentary on the Bible, Lev. 11:3; Sefer ha-Ḥinukh, nos. 72 and 147. However, other rabbinic scholars were most emphatic in their denial of a hygienic interpretation of the laws of forbidden foods. Thus, R. Isaac Abarbanel writes, "Heaven forfend that I should believe so. For if that were to be so, the Book of God's Law would be in the same category as any of the brief medical books…. This is not the way of God's law or the depth of its intentions." ⁷Commentary on the Bible, Lev. 11:13. In almost identical language, R. Isaac Arama disparages this explanation, commenting that such an interpretation would "lower the status of divine Law to the status of any brief medical composition." ⁸Akedat Yiẓḥak, Sha‘ar 60. See also Kli Yakar, Lev. 11:1 and Menachem ha-Bavli, Ta‘amei ha-Miẓvot, negative commandments, no. 84.

Dietary proscriptions include categories of food which are forbidden by their nature and others which are forbidden because of their mode of preparation. Various species of animals, fowl, fish, and creeping things are described in the Torah and declared "unclean" (Lev. 11:1–23 and 41–47, Deut. 14:3–19).