Reference for Chullin 153:1

נמנין עליהן בפסח

people may be counted in to partake thereof in the Passover-offering.<span class="x" onmousemove="('comment',' One fulfils one's obligation by eating these sinews of the Passover offering, for being now tender they are regarded as flesh; v. Pes. 84a.');">¹</span>

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