Reference for Eruvin 199:19

א"ר אליעזר לא אמרו אלא כשהוא בעצמו אמר לו ר' יהושע לא נאמר בל תגרע אלא כשהוא בעצמו

Now, according to R'Eliezer who laid down there<span class="x" onmousemove="('comment',' Zeb. 80a.');">⁵⁴</span> that the performance of an uncertain precept<span class="x" onmousemove="('comment',' Lit., 'arise and do'.');">⁵⁵</span> is preferable.<span class="x" onmousemove="('comment',' To its neglect.');">⁵⁶</span> the man may here also<span class="x" onmousemove="('comment',' Where he was on the Sabbath on a tree.');">⁵⁷</span>

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