Reference for Bava Batra 191:9

כמאן פשט ליה פליגי בה רב מרי ורב זביד חד אמר כרבי יוחנן וחד אמר כרבי יהושע בן לוי:

and then you say [that during the] last [three days it is regarded as] certainly vinegar, [which] proves clearly [that if the] odour is vinegar and the taste, wine, [it is regarded as] vinegar?<span class="x" onmousemove="('comment',' For if it is regarded as wine, despite the odour of vinegar, the contents may still have been wine three days ');">¹⁶</span> — [The second clause deals with the case] when it was found [to be] very strong vinegar [in which case it is known] that had it not lost its taste three days [previously], it could not have been found [to be such] very strong vinegar.<span class="x" onmousemove="('comment',' The deterioration must consequently have commenced six days previously. In the first three, of these six days, it was still regarded as wine; for his opinion, like that of R. Johanan, is that the odour alone does not deprive the wine of its name, During the last three, of these six days, both odour and taste were that of vinegar, hence his decision is, in such a case, that 'during the last three days it is regarded as certainly vinegar.' ');">¹⁷</span>

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