Tosefta for Chullin 225:49
נאמר (דברים יד, כא) לא תאכלו כל נבלה ונאמר לא תבשל גדי בחלב אמו את שאסור משום נבלה אסור לבשל בחלב עוף שאסור משום נבלה יכול יהא אסור לבשל בחלב ת"ל
AND IN THE SAME VERSE IT IS WRITTEN, THOU SHALT NOT SEE THE A KID IN ITS MOTHER'S MILK; THEREFORE WHATSOEVER IS PROHIBITED.
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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