Reference for Moed Katan 23:1

אמר שמואל מקבלי קיבולת בתוך התחום אסור חוץ לתחום מותר

Samuel said: '[If non-Jews] take work on contract they may not [work for a Jew]<span class="x" onmousemove="('comment',' People might say that they were given the work on the Sabbath.');">¹</span> within the [limits of the Sabbath] boundary;<span class="x" onmousemove="('comment',' On a Sabbath or Festival (Rash) . V. however, Asheri.');">²</span>

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