Commentary for Pesachim 137:2

תניא אמר רבי אליעזר ומה לי אם דחו מכשירי מצוה שלאחר שחיטה את השבת דאיתעביד ליה מצוה לא ידחו מכשירי מצוה שלפני שחיטה את השבת

It was taught. R. Eliezer said: I argue, if the necessary adjuncts of the precept which [come] after shechitah, when the precept has [already] been performed, override the Sabbath; shall not the necessary adjuncts of the precept which [come] before shechitah override the Sabbath! Said R. Akiba to him: If the necessary adjuncts of the precept which [come] after shechitah override the Sabbath, the reason is because the shechitah has [already] overridden the Sabbath; will you say that the necessary adjuncts of the precept before the shechitah shall override the Sabbath, seeing that the shechitah has not [yet] overridden the Sabbath? Another argument is: the sacrifice may be found to be unfit, and thus he will be found retrospectively to have desecrated the Sabbath. If so, let us not slaughter it either, lest the sacrifice be found unfit, and thus it be found that he retrospectively desecrated the Sabbath? - Rather, he first told him this [argument], and he refuted it; and then he told him this 'the reason is etc.

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