Comentario sobre Baba Kama 4:6
שׁוֹר שֶׁהָיָה מִתְחַכֵּךְ בְּכֹתֶל וְנָפַל עַל הָאָדָם, נִתְכַּוֵּן לַהֲרֹג אֶת הַבְּהֵמָה וְהָרַג אֶת הָאָדָם, לְנָכְרִי וְהָרַג אֶת יִשְׂרָאֵל, לִנְפָלִים וְהָרַג בֶּן קְיָמָא, פָּטוּר:
Si un buey se frota contra una pared y cae sobre un hombre (y lo mata), [no se lo mata. Y si se tratara de un muad, como cuando se trata de un muad que se frota contra las paredes y hace que caigan sobre los hombres, y se frota sobre una pared para aliviarse y lo derriba sobre un hombre y él muere, el buey no se pone hasta la muerte y el dueño paga kofer. El buey no es ejecutado, está escrito (Éxodo 21:29): "El buey será apedreado y también su dueño morirá"—Como la muerte del dueño, también lo es la muerte del buey. Del mismo modo que el propietario no es responsable a menos que haya matado con intención, el buey no es responsable a menos que haya matado con intención. Y el propietario paga kofer, que está escrito (Ibid. 30): "If kofer". Podría haberse escrito: "Kofer se establecerá para él". ¿Por qué "si kofer"? Incluir el asesinato no intencional en la responsabilidad de Kofer.] Si pretendía matar a una bestia y matar a un hombre, matar a un idólatra y matar a un judío, matar a un nefel (uno de nacimiento no viable), y mató a un ben kayama (uno con "vida"), no es ejecutado.
Rambam on Mishnah Bava Kamma
Bartenura on Mishnah Bava Kamma
English Explanation of Mishnah Bava Kamma
or if it intended to kill an animal and it killed a man;
or if it intended to kill a gentile and it killed an Israelite;
or if it intended to kill an untimely birth and it killed a viable infant,
it is exempt [from death by stoning].
Mishnah six deals with several instances in which an ox that kills another Jewish human being but unintentionally. In section one the ox was only scratching its back and certainly had no intention to kill. In section two the ox did have intention to kill but its intention was to kill an animal. In section three the ox did have the intention to kill a human being, but its intention was directed at killing a gentile. According to the mishnah an ox that kills a gentile will not be judged in the same way as an ox that kills a Jew. (With regards to Jewish-gentile relations see the discussion on chapter four mishnah three.) In section four the ox did have intention to kill a Jewish human being, but that Jewish human being would not have been able to live. (According to the Rabbis understanding of medicine a child born after eight months could not survive). In all of these cases since the intention was to kill something for which the ox would not be liable for the death penalty the ox is exempt from the death penalty. In other words we judge the ox by its intention and not by its actions.