Tosefta for Chullin 225:28
אין מחזיקין דם בבני מעיים תרגמא אכרכשא ומעייא והדרא דכנתא
this is explained as referring specifically to the rectum, the small intestines, and the coil of the colon.
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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