Reference for Chullin 186:13

אומצי ביעי ומזרקי פליגי בה רב אחא ורבינא

if it was cut up and salted, it is even permitted [to be cooked] in a pot; if it was thrust on a spit [an held over the fire], the blood would easily flow out; if it was placed on the coals, in this there is a dispute between R'Aha and Rabina: one says that they [the coals] would draw out the blood, and the other says that they would cause [the meat] to contract.<span class="x" onmousemove="('comment',' So that the blood would not flow out and it is therefore forbidden.');">⁶</span>

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