Reference for Pesachim 37:3

אלא ר"ע לא סבר כר' יוסי מנלן

But how do we know that R'Akiba does not agree with R'Jose?<span class="x" onmousemove="('comment',' In the validity of this argument.');">⁴</span> - Said he to him, Because a Tanna could not completely refrain from teaching [that there is] a fourth in the case of terumah and a fifth in the case of sacred food, and we would say that it agrees with R'Akiba.<span class="x" onmousemove="('comment',' For R. Akiba must hold thus if he');">⁵</span>

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