Reference for Yevamot 30:4

ובית הלל אומרים צריכה לנקב ומודים שאם ניקבה וסתמוה שמרים שהיא טהורה

and we learned: A jar containing pickled olives, Beth Shammai said, need not be broached;<span class="x" onmousemove="('comment',' Because in their opinion the moisture that exudes from the olives is regarded as a fruit juice which does not render food susceptible to Levitical uncleanness. ');">⁷</span> but Beth Hillel say: It must be broached.<span class="x" onmousemove="('comment',' The moisture is regarded by them as actual oil which does render food susceptible to uncleanness. Broaching is consequently necessary in order to indicate thereby that the owner had no desire to preserve the liquid. ');">⁸</span>

Jastrow

Jastrow

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