Reference for Chullin 58:8
מצוה למרק:
Furthermore all agree that in the case of a burnt-offering of a bird, where the priest nipped the first organ below<span class="x" onmousemove="('comment',' There was a red line running horizontally along the wall of the altar and the blood had to be sprinkled either above or below this line according to the particular sacrifice offered. With regard to a consecrated bird the priest, immediately after the nipping, (which in the case of a burnt-offering had to be performed whilst the priest was standing on the circuit round the altar which was above the red line) had to allow the blood to drain by pressing the neck of the bird against the wall of the altar, below the red line in the case of a sin-offering, and above it in the case of a burnt-offering. V. Zeb. 64b-65a.');"><sup>4</sup></span>