Related for Avodah Zarah 60:7
וכן אבטיח שנתגלתה אע"פ שאכלו ממנה ט' בני אדם ולא מתו לא יאכל ממנה עשירי מעשה היה ואכלו ממנה תשעה ולא מתו ואכל עשירי ומת א"ר זהו שוקע
Likewise if a [cut] melon was left uncovered and nine persons ate of it without dying, it is forbidden for a tenth person to eat from it, for it once happened that nine persons ate of such a one and did not die and the tenth one who ate it died; and Rav said that it was a case of venom that sank 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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