Reference for Chullin 167:2

בעינן העמדה והערכה

and then cover up [its blood]? - Because [in order to redeem a consecrated living thing] it must be stood up and appraised [by the priest].<span class="x" onmousemove="('comment',' V. Lev. XXVII, 11, 12. The living thing when being redeemed must be able to stand up while it is being valued by the priest, but here the bird is already dead.');">²</span>

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