Reference for Chullin 230:9

ורבי בהנאה מנא ליה

- From that teaching I might have thought that the prohibition was only in respect of eating but not in respect of deriving benefit from it, he therefore teaches us [another teaching].<span class="x" onmousemove="('comment',' R. Simeon b. Lakish derives the prohibition against making use of flesh cooked in milk from the verse in connection with the paschal lamb. For just as the latter, if cooked and not roasted, would be forbidden for all purposes as all sacrificial flesh which has been rendered unfit so flesh cooked in milk is forbidden for all purposes. ause og');">⁴</span>

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