Tosefta for Chullin 194:31
כי משערינן בדידיה משערינן או במאי דנפק מיניה משערינן
R'Ashi said: When we were at R'Kahana's the question was put before us: When measuring, should one measure [the prohibited substance] itself or only the essence which exuded from it?<span class="x" onmousemove="('comment',' For the actual forbidden substance has now been removed from the pot, and the question is only with regard to the essence that exuded from it.');"><sup>18</sup></span>
Tosefta Terumot
Unclean fish that was pickled with clean fish: He washes [the clean fish] thoroughly and it is permitted. Unclean salted fish and clean unsalted fish: It is forbidden. Clean salted fish and unclean unsalted fish: It is permitted. Unclean fish that was cooked with clean fish: We treat it as though [the clean fish was cooked with] leeks (see Hul. 97b:8) -- if there is sufficient quantity to impart taste, it is forbidden, and if not, it is permitted.
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