Reference for Pesachim 34:1

(רבן) שמעון אומר בכלים טמאין בקרקע טהורין

R'Simeon said: In vessels, they are unclean; in the ground, they are clean.<span class="x" onmousemove="('comment',' V. infra.');">¹</span> R'Papa said: Even on the view that the uncleanness of liquids is Biblical, [the non-defilement of] the liquids of the slaughterhouse is a traditional law.

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