Reference for Eruvin 60:10

ולפרוש עלה מיניה וביה דלית בה שיעורא

are not suspected of setting aside terumah from [produce] that is not in close proximity [to the produce for which it is set aside]. But he can [still] Set aside the terumah for it from [the very 'erub] itself [This is a case] where it<span class="x" onmousemove="('comment',' The 'erub after terumah would have been separated from it.');">²⁴</span> would not contain the prescribed quantity. But why this certainty?<span class="x" onmousemove="('comment',' That the Tanna deals only with an 'erub that was so small in quantity. As a general ruling one would rather expect it to apply to all cases.');">²⁵</span>

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