Reference for Pesachim 34:4

א"ל רבינא לרב אשי והא ר"ש דאמר טומאת משקין דאורייתא דתניא ר' יוסי ור' שמעון אומרים לכלים טהורין לאוכלין טמאין

But if it traditional law, what is the difference whether they are in vessels or in the ground? - This is a difficulty. R'Papa said: As to what you say,'In the ground, they are clean', this was taught only of water, but not of blood.

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