Reference for Bava Batra 191:5

מאי טעמא חמרא מתתאי עקר ואימור עקר ולאו אדעתיה ואם תמצא לומר מעילאי עקר והא טעימיה ולא עקר דלמא בתר דטעימיה עקר הוה ריחיה חלא וטעמי' חמרא וריחיה חלא וטעמיה חמרא חלא

What is the reason? — [Because] wine [begins to] deteriorate from above,<span class="x" onmousemove="('comment',' Deteriorations of the wine on the surface takes place first, and then it gradually spreads downwards till all turns sour. During this process, though the contents have the odour of vinegar, the flavour is still that of wine. ');">⁹</span> and this [man] had tasted it [and ascertained that] it had not deteriorated; [and] if it be assumed that it had deteriorated [immediately] after it had been tasted, [even then during the first three days], it had the odour of vinegar and the taste of wine, and whenever the odour is of vinegar and the taste is of wine, it is regarded as wine. And R. Joshua b. Levi said: [The meaning of the Baraitha is that] during the last three days<span class="x" onmousemove="('comment',' Prior to the discovery that it turned into vinegar. ');">¹⁰</span>

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