Reference for Pesachim 156:1

הא אמרת בציבור אפילו רבי יהושע מודה

Surely you have said, even R'Joshua agrees in the case of a community! Rather [explain it thus:] I agree with the words of R'Eliezer where It was done [offered], and with the words of R'Joshua [where it is] at the very outset. [But] if it was done, even R'Joshua agrees, for it is taught: R'Joshua agrees that if he sprinkled [th blood] it is made acceptable?

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