Reference for Menachot 217:23

ואזדו לטעמייהו דאתמר הזיד בשחיטה רב נחמן אמר קרבנו ריח ניחוח ורב ששת אמר אין קרבנו ריח ניחוח

and immediately afterwards it is written, And they shall not come near unto Me, to minister unto Me in the priest's office.<span class="x" onmousemove="('comment',' Ibid. 13.');">²²</span> Thus only if they performed service [unto idols are they disqualified], but slaughtering is no service.<span class="x" onmousemove="('comment',' For even in the Temple it may be performed by non-priests.');">²³</span>

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