Jerusalem Talmud Makkot 2:2

משנה: נִשְׁמַט הַבַּרְזֶל מִקַּתּוֹ וְהָרַג רִבִּי אוֹמֵר אֵינוֹ גוֹלֶה. וַחֲכָמִים אוֹמְרִים גּוֹלֶה. מִן הָעֵץ הַמִּתְבַּקֵּעַ רִבִּי אוֹמֵר גּוֹלֶה. וַחֲכָמִים אוֹמְרִים אֵינוֹ גוֹלֶה׃ MISHNAH: If the iron slipped off the handle and killed, Rebbi said he does not go into exile, but the Sages say he does go. From the wood to split, Rebbi says he goes into exile, but the Sages say, he does not go¹⁰This is a matter of interpretation of Deuteronomy.19.5">Deut. 19:5 as explained in the Makkot.7b-8a">Halakhah (Babli 7b/8a, Sifry Deut. 183.) The Babli points out that for the Sages indirect causation is not punishable as negligence, while for Rebbi it is..

הלכה: נִשְׁמַט הַבַּרְזֶל מִקַּתּוֹ כול׳. מַה טַעֲמָא דְרִבִּי נֶאֱמַר כָּאן נְשִׁילָה וְנֶאֱמַר לְהַלָּן כִּ֥י יִשַּׁ֖ל זֵיתֶֽיךָ. מַה נְשִׁילָה שֶׁנֶּאֶמְרָה לְהַלָּן נְשִׁירָה אַף כָאן נְשִׁירָה. מַה טַעֲמוֹן דְּרַבָּנִין. נֶאֱמַר כָּאן נְשִׁילָה וְנֶאֱמַר לְהַלָּן וְנָשַׁל֩ יְי אֱלֹהֶ֜יךָ אֶת־הַגּוֹיִ֥ם הָאֵ֛ל מִפָּנֶי֖ךָ וגו׳. מַה נְשִׁילָה שֶׁנֶּאֶמְרָה לְהַלָּן מַכָּה אַף כָאן מַכָּה. HALAKHAH: “If the iron slipped off the handle,” etc. What is Rebbi’s reason? It is said here¹¹In Deuteronomy.19.5">Deut. 19:5: וְנָשַׁ֤ל הַבַּרְזֶל֙ מִן־הָעֵ֔ץ the iron was lost from the wood. The wood might either be the handle or the tree to be felled. Cf. Arabic نسل “to beget, procreate; to pluck; to unravel, untwist, fray; to molt; to fall out” (1^st conjugation). getting lost and it says there¹²Deut. 17:40. נשר is Mishnaic Hebrew for all material shed by a plant., for your olives will fall off. Since getting lost there means falling off, here also it means falling off. What is the rabbis’ reason? It is said here getting lost and it says there¹³Deuteronomy.7.22">Deut. 7:22., the Eternal, your God, will eliminate these peoples before you. Since getting lost there means taking a hit, here also taking a hit.