Shabbat 75a
שבת ע״ה א — ד"ה רָבָא אָמַר
Shabbat 75a:6
Presents the classic discussion of פסיק רישיה, the inevitable result of an otherwise permitted act, establishing the key Talmudic category used in modern refrigerator cases.
רָבָא אָמַר: אֲפִילּוּ תֵּימָא שֶׁפְּצָעוֹ חַי, מִתְעַסֵּק הוּא אֵצֶל נְטִילַת נְשָׁמָה. וְהָא אַבָּיֵי וְרָבָא דְּאָמְרִי תַּרְוַויְיהוּ: מוֹדֶה רַבִּי שִׁמְעוֹן בִּ״פְסִיק רֵישֵׁיהּ וְלֹא יָמוּת״! שָׁאנֵי הָכָא, דְּכַמָּה דְּאִית בֵּיהּ נְשָׁמָה טְפֵי נִיחָא לֵיהּ, כִּי הֵיכִי דְּלֵיצִיל צִיבְעֵיהּ.
Rava said: Even if you say that he broke it when it was alive, he is exempt. Since he had no intention of killing the ḥilazon, he is considered as one who is acting unawares with regard to taking a life. The Gemara raises a difficulty: Didn’t Abaye and Rava both say that Rabbi Shimon, who rules that an unintentional act is permitted, agrees that in a case of: Cut off its head and will it not die, one is liable? One who performs an action that will inevitably result in a prohibited labor cannot claim that he did not intend for his action to lead to that result. Lack of intention is only a valid claim when the result is merely possible, not inevitable. Since one who extracts blood from a ḥilazon inevitably takes its life, how can Rava claim that his action is unintentional? The Gemara answers: Here it is different, as the longer the ḥilazon lives, the better it is for the trapper, so that its dye will become clear. Dye extracted from a live ḥilazon is a higher quality than that which is extracted from a dead one. Rabbi Shimon agrees that one who performs an action with inevitable consequences is liable only in a case where the consequences are not contrary to his interests. Since he prefers that the ḥilazon remain alive as long as possible, he is not liable for the inevitable consequences.






