Reference for Eruvin 199:20

ועוד א"ר יהושע כשנתת עברת על בל תוסיף ועשית מעשה בידך כשלא נתת עברת על בל תגרע ולא עשית מעשה בידך

climb down,<span class="x" onmousemove="('comment',' By doing this he escapes the prohibition against his continued use of the tree.');">⁵⁸</span> while according to R'Joshua who held there<span class="x" onmousemove="('comment',' Zeb. 80a.');">⁵⁴</span> that the abstention from the performance of an uncertain precept<span class="x" onmousemove="('comment',' Lit., 'sit and do not act'.');">⁵⁹</span> is preferable.<span class="x" onmousemove="('comment',' To its performance.');">⁶⁰</span>

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