Reference for Temurah 27:17

כי קתני בעיקר זיבחא קתני

But is there not the case of a substitute itself which is a sacrifice of an individual and a substitute cannot effect an exchange?<span class="x" onmousemove="('comment',' One cannot say: 'Let that animal be in place of this exchange' in order to acquire holiness.');">¹¹</span>

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