Reference for Eruvin 116:7

הגיע להר מבליעו וחוזר למידתו: אמר רבא לא שנו אלא בהר המתלקט י' מתוך ד' אבל בהר המתלקט י' מתוך ה' מודדו מדידה יפה

but a hill that has a rise of ten handbreadths to five cubits must be measured in the usual manner.<span class="x" onmousemove="('comment',' Such a gentle slope is deemed to be on a par with level ground which may not be measured either by spanning or by piercing.');">¹³</span> R'Huna son of R'Nathan taught this<span class="x" onmousemove="('comment',' Raba's view just enunciated.');">¹⁴</span> in the direction of leniency: Raba explained.

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