Reference for Chullin 215:13

מכדי רב כמאן אמר לשמעתיה כרבי יהודה דאמר

- Said Raba to him: The Torah has expressed this prohibition by the term 'cooking'.<span class="x" onmousemove="('comment',' The prohibition of 'flesh in milk' is thrice expressed in the Torah by the term 'cooking', and cooking signifies the imparting of a flavour from one substance to the other.');">¹¹</span>

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