Reference for Eruvin 40:1

וכן בגת

and the same [ruling applies to one drinking from, or] in a wine-press.<span class="x" onmousemove="('comment',' Shab. 11a, infra 99a; where wine may be drunk before it is tithed.');">¹</span> Now in the case of a human being it has been laid down that it is necessary for his head and the greater part of his body [to be in the domain from which he drinks], is it necessary in the case of a cow also<span class="x" onmousemove="('comment',' Where it stands in a public domain and its keeper in a private domain.');">²</span>

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