Reference for Chullin 274:27

דאורייתא בששים דרבנן בארבעים

But has not Samuel stated that one grain of wheat frees the stack?<span class="x" onmousemove="('comment',' The obligation of terumah can be discharged by the removal of one grain from the heap, since the Torah does not prescribe any specific amount.');">¹³</span>

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