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Rules of R. Ishmael, the Thirteen

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Thirteen rules compiled by Rabbi see ISHMAEL B. ELISHA for the elucidation of the Torah and for making halakic deductions from it. They are, strictly speaking, mere amplifications of the seven Rules of Hillel, and are collected in the BARAITA OF R. ISHMAEL, forming the introduction to the Sifra and reading a follows:

1. Ḳal wa-ḥomer: Identical with the first rule of Hillel.
2. Gezerah shawah: Identical with the second rule of Hillel.
3. Binyan ab: Rules deduced from a single passage of Scripture and rules deduced from two passages. This rule is a combination of the third and fourth rules of Hillel.
4. Kelal u-Peraṭ: The general and the particular.
5. u-Peraṭ u-kelal: The particular and the general.
6. Kelal u-Peraṭ u-kelal: The general, the particular, and the general.
7. The general which requires elucidation by the particular, and the particular which requires elucidation by the general.
8. The particular implied in the general and excepted from it for pedagogic purposes elucidates the general as well as the particular.
9. The particular implied in the general and excepted from it on account of the special regulation which corresponds in concept to the general, is thus isolated to decrease rather than to increase the rigidity of its application.
10. The particular implied in the general and excepted from it on account of some other special regulation which does not correspond in concept to the general, is thus isolated either to decrease or to increase the rigidity of its application.
11. The particular implied in the general and excepted from it on account of a new and reversed decision can be referred to the general only in case the passage under consideration makes an explicit reference to it.
12. Deduction from the context.
13. When two Biblical passages contradict each other the contradiction in question must be solved by reference to a third passage.

Rules seven to eleven are formed by a subdivision of the fifth rule of Hillel; rule twelve corresponds to the seventh rule of Hillel, but is amplified in certain particulars; rule thirteen does not occur in Hillel, while, on the other hand, the sixth rule of Hillel is omitted by Ishmael. With regard to the rules and their application in general also Talmud—Hermeneutics.