Reference for Menachot 216:12

רבי אוסר לפי שאין בילה: טעמא דאין בילה הא יש בילה שרי

but we have learnt: [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. [IF HE SAID,] 'THIS LAMB SHALL BE A BURNT-OFFERING', AND IT SUFFERED A BLEMISH, HE MAY, IF HE SO DESIRES, BRING A RAM WITH THE PRICE THEREOF.

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