Reference for Shabbat 16:12

ואלא אסקופת רה"י נוטל מן העני הא קא מעייל מרה"ר לרה"י

And do not think that I am merely putting you off, but I say it to you with exactitude.<span class="x" onmousemove="('comment',' Viz., that service with difficulty is not regarded as public use. ');">¹²</span>

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