Mesorat%20hashas for Chullin 132:30

את זה תאכלו מכל אשר במים וגו' בימים ובנחלים הוא דכי אית ליה אכול דלית ליה לא תיכול

'in the seas and in the rivers' is specification; we thus have a general proposition followed by a specification, in which case the scope of the general proposition is limited to the particulars specified; hence only with regard to those found in the seas and in the rivers [are the distinguishing marks of fins and scales essential], but not with regard to those found in gutters and trenches!<span class="x" onmousemove="('comment',' So that all creeping things found in gutters and in trenches, and a fortiori those found in standing water as e.g. in cisterns, are permitted. This being so, the previous exposition of v. 9 which establishes that all creeping things found in cisterns etc. are permitted is rendered superfluous.');">¹⁶</span>

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