Reference for Menachot 216:5

ולפלוג נמי ברישא

- Rabbi indeed disagrees with the whole teaching, but he waited until the Rabbis had stated their view in full and then expressed his dissent. This can also be proved, for [the Mishnah] states: [IF HE SAID,] 'THIS RAM SHALL BE A BURNT-OFFERING', AND IT SUFFERED A BLEMISH, HE MAY, IF HE SO DESIRES, BRING A LAMB WITH THE PRICE THEREOF.

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