Commentary for Yevamot 41:12

רב כהנא אמר מהכא (ויקרא יח, ל) ושמרתם את משמרתי עשו משמרת למשמרתי

may be derived from the following: Avoid it, pass not by it; turn from it, and pass on.<span class="x" onmousemove="('comment',' Prov. IV, 15; an allusion to the Torah. One must add restrictions to its precepts, such as those of incest of the second degree, in order to keep away from any possible infringement of its original precepts. ');">²⁹</span> Said R. Ashi: R. Oshaia's interpretation may be represented by the simile<span class="x" onmousemove="('comment',' Lit., 'the parable of R. Oshaia, to what may the thing be compared?' ');">³⁰</span> of a man who guards an orchard. If he guards it from without, all of it is protected. If, however, he guards it from within, only that, section in front of him is protected but that which is behind him is not protected. This statement of R. Ashi, however, is mere fiction.<span class="x" onmousemove="('comment',' [H] v. B.M., Sonc. ed. p. 47, n. 1. ');">³¹</span>

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