Reference for Bava Batra 196:1

תאנא ומיישן והולך עד החג:

A Tanna taught: [If wine was sold as 'very old'], it must be capable of standing until the Feast of Tabernacles.<span class="x" onmousemove="('comment',' From the Tabernacles (the vintage season) of the second year prior to the sale, until the Tabernacles of the year of the sale, making a total period of three complete years. If it did not keep, the seller must bear the loss. ');">¹</span>

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