Reference for Bava Metzia 147:4

רבנן אמרי לקבולי עליה מי שפרע

R. papi said in Raba's name: The mark [on the wine-barrels]<span class="x" onmousemove="('comment',' [H]. When merchants bought wine, they left it in the cellars of the growers, taking out barrel by barrel according to need, and affixed a mark on each that they had bought. [Asheri in name of R. Han. explains it as 'handshake', a recognised method among traders of closing a deal.] ');">³</span>

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