Reference for Zevachim 148:5

ואי מדר"ל ה"א חבית דמינכרא נפילתה אבל טבעת דלא מינכרא נפילתה לא צריכי

R. Oshaia said: If a [sealed] cask of terumah was mixed up with a hundred and fifty casks, and a hundred of them were opened [accidentally], he removes from them the proportion of the mixture and drinks, but the rest are forbidden until they are opened [accidentally], [for] we do not say, The forbidden article is in the majority. <br>

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