Reference for Chullin 248:13

אין נוגע וחוזר ונוגע

Now does not R'Dosa B'Harkinas hold that two overshadowings<span class="x" onmousemove="('comment',' Each time of half the minimum quantity. According to R. Dosa b. Harkinas, overshadowing must be in one place, at the same time, and over a whole olive's bulk.');">¹¹</span>

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