Reference for Pesachim 44:10

ואידך את לא דריש

- In truth 'it shall not be eaten' implies a prohibition of eating an a prohibition of benefit, and as to 'but the owner of the ox shall be clear,' that is stated<span class="x" onmousemove="('comment',' Lit., 'comes'.');">¹⁶</span> in respect of the use of its skin;<span class="x" onmousemove="('comment',' Teaching, even that is forbidden.');">¹⁷</span> and it is necessary: you would think that I might argue, 'his flesh shall not be eaten' is written [thus] only his flesh [is forbidden], but not his skin; therefore we are informed [otherwise].

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