Reference for Pesachim 159:8

ועולא אמר משלחין אחד מהן לדרך רחוקה ויטמאנו בשרץ

If so, the majority are unclean, [then] let them all sacrifice in uncleanness? - He holds as R'Eleazar B'Mathia, who maintained: A single individual cannot overbalance the community to uncleanness.

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