Reference for Bekhorot 66:33

לא יחדש בה דבר

And it may be that R'Eliezer holds this view only [in connection with doubtful terumah], in case Elijah should come and pronounce it clean,<span class="x" onmousemove="('comment',' By declaring that, for example, no dead reptile touched the terumah.');">²¹</span>

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