Reference for Chullin 220:15

מ"ש למיסר נפשה דלא מיבעיא לך דתנן

When he [R'Safra] returned, Abaye said to him: 'I had no doubt at all that it, itself, was forbidden;<span class="x" onmousemove="('comment',' It is certainly permitted because it is discharging blood all the time during the cooking and will not absorb at all.');">³</span>

Jastrow

Jastrow