Reference for Zevachim 214:2

א"כ לא יאמר בזריקה ותיתי מבינייא

let it not be stated in connection with sprinkling, which may be inferred from both [shechitah and offering up] combined. [Thus: when you say,] let it be inferred from shechitah, [you can argue], as for shechitah, the reason is because it is invalid in the case of the Passover-offering [when done] on behalf of such who cannot eat.

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