Reference for Eruvin 40:2
גבי אדם הא אמר דבעי ראשו ורובו גבי פרה מי בעינן לה ראשה ורובה או לא
that its lead and the greater part of its body [shall be in the domain from which it drinks] or not? Wherever [the keeper] holds the vessel<span class="x" onmousemove="('comment',' From which the cow drinks.');"><sup>3</sup></span>
Jastrow
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