Reference for Pesachim 159:12

במת נמי אפשר דעביד בשביעי דהוה ליה שמיני שלו

who rules: [When there is] half against half they must not all sacrific in uncleanness, and [also] he agrees with R'Judah who said: A public sacrifice cannot be divided, then we defile one of them with a reptile.

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