Reference for Yoma 65:1
לכך שנינו רוב אחד בעוף ורוב שנים בבהמה וכי מאחר דאפילו פסולא מדרבנן ליכא למה לי למרק מצוה למרק
therefore we have learnt: The bigger part of an organ with a fowl, the bigger part of two organs with an animal - But since, even by Rabbinic ordinance, it would be considered not invalidated,<span class="x" onmousemove="('comment',' If the other priest did not finish the cutting of the organs.');"><sup>1</sup></span> why does he [the other one] have to finish it? - It is the proper thing [a command] to finish it.<span class="x" onmousemove="('comment',' In order to obtain a proper supply of blood for the services of the day.');"><sup>2</sup></span> Abaye related the order of the [daily] priestly functions in the name of tradition and in accordance with Abba Saul:<span class="x" onmousemove="('comment',' V. supra 14b.');"><sup>3</sup></span>