Related for Taanit 59:6
תניא כלישנא קמא תניא כלישנא בתרא תניא כלישנא בתרא הסועד ערב תשעה באב אם עתיד לסעוד סעודה אחרת מותר לאכול בשר ולשתות יין ואם לאו אסור לאכול בשר ולשתות יין
It has also been taught according to the first statement: On the eve of the Ninth of Ab one may not partake of a meal of two courses, nor may he eat meat nor drink wine. R'Simeon B'Gamaliel says: He should make a difference [in his diet]. What constitutes a difference in diet?
Tosefta Terumot
It so happened that a dead snake was found in a wine cistern and they came and asked Rabbi Yehudah ben Bava, and he [ruled that] the cistern remained permissible [as the] wine was fermenting. As long as it is still fermenting, it is not subject to the prohibitions of exposed liquids (Sanh. 70a:10). And how long does it ferment? Three days.
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