Reference for Bava Metzia 158:2

אמר רב פפא לא משכחת לה אלא בספינה זו ויין זה אבל בספינה סתם ויין סתם חולקין

But in the case of an unspecified ship and unspecified wine, they must divide.<span class="x" onmousemove="('comment',' Only half the fee is payable, whether it has been delivered or not, since each is theoretically in a position to fulfil his part of the agreement. ');">²</span>

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