Reference for Bekhorot 66:24

אפי' מת אין מקיזין לו את הדם

For we have learnt: If there is a jug of terumah concerning which there is a doubt as to it levitical cleanness, R'Eliezer says: If it was lying in a filthy place, he must put it in a cleanly place, and was open, he must cover it.

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