Reference for Chullin 230:16

דבי רבי ישמעאל תנא

The Torah here implies that when you sell it you may not first cook it [in milk] and then sell it.<span class="x" onmousemove="('comment',' For as soon as it has been cooked in milk it is forbidden to be sold or used for any purpose.');">¹⁰</span>

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