Reference for Menachot 171:1

ואם הביא פסול (והתניא ואם הביא כשר) מפני שהוא שרף

and if one did bring it it was invalid, for it is only the sap [of the olive]? - R'Joseph answered, It is no difficulty; one teaching<span class="x" onmousemove="('comment',' Sc. the Baraitha which states that anfakinon is absolutely invalid.');">¹</span> represents the view of R'Hiyya, and the other represents the view of R'Simeon son of Rabbi.

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