Related for Avodah Zarah 60:6
של בחור שוקע למאי הלכתא דתניא חבית שנתגלה אע"פ ששתו ממנה תשעה ולא מתו לא ישתה ממנה עשירי מעשה היה ששתו ממנו תשעה ולא מתו ושתה עשירי ומת אמר ר' ירמיה זהו שוקע
The venom of a young one sinks to the bottom. What practical application does this have? As it is taught: If a barrel was uncovered, even if nine persons drank from it and did not die, the tenth person is still forbidden to drink from it. It happened indeed that nine people drank from it and did not die but the tenth one died; and R. Jeremiah said: It was a case of the venom sinking to the bottom.
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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