Related for Bekhorot 5:3

הַצּוֹרֵם בְּאֹזֶן הַבְּכוֹר, הֲרֵי זֶה לֹא יִשָּׁחֵט עוֹלָמִית, דִּבְרֵי רַבִּי אֱלִיעֶזֶר. וַחֲכָמִים אוֹמְרִים, כְּשֶׁיִּוָּלֵד לוֹ מוּם אַחֵר, יִשָּׁחֵט עָלָיו. מַעֲשֶׂה בְזָכָר שֶׁל רְחֵלִים זָקֵן וּשְׂעָרוֹ מְדֻלְדָּל, רָאָהוּ קַסְדּוֹר אֶחָד, אָמַר, מַה טִּיבוֹ שֶׁל זֶה. אָמְרוּ לוֹ, בְּכוֹר הוּא וְאֵינוֹ נִשְׁחָט אֶלָּא אִם כֵּן הָיָה בּוֹ מוּם. נָטַל פִּגְיוֹן וְצָרַם בְּאָזְנוֹ, וּבָא מַעֲשֶׂה לִפְנֵי חֲכָמִים וְהִתִּירוּהוּ. רָאָה שֶׁהִתִּירוּ, וְהָלַךְ וְצָרַם בְּאָזְנֵי בְכוֹרוֹת אֲחֵרִים, וְאָסָרוּ. פַּעַם אַחַת הָיוּ תִינוֹקוֹת מְשַׂחֲקִין בַּשָּׂדֶה וְקָשְׁרוּ זַנְבוֹת טְלָאִים זֶה לָזֶה, וְנִפְסְקָה זְנָבוֹ שֶׁל אֶחָד מֵהֶם וַהֲרֵי הוּא בְכוֹר, וּבָא מַעֲשֶׂה לִפְנֵי חֲכָמִים וְהִתִּירוּהוּ. רָאוּ שֶׁהִתִּירוּ, וְהָלְכוּ וְקָשְׁרוּ זַנְבוֹת בְּכוֹרוֹת אֲחֵרִים, וְאָסָרוּ. זֶה הַכְּלָל, כֹּל שֶׁהוּא לְדַעְתּוֹ, אָסוּר. וְשֶׁלֹּא לְדַעְתּוֹ, מֻתָּר:

If one slits the ear of a firstborn it may never be slaughtered, according to Rabbi Eli'ezer. The sages say: Once it develops another blemish it may be slaughtered on that [basis]. It once happened that a Roman official saw an old ram with its wool matted and asked: "What is with this one?" They answered: "It is a firstborn and it may not be slaughtered unless it develops a blemish." He took a dagger and slit its ear. It came before the sages, and they permitted it. Once he saw that [the sages] permitted it, he went and made slits in the ears of other firstborns, and [the sages] forbade them. It once happened that children were playing in a field, and they tied the tails of two lambs to each other. One of the tails, belonging to a firstborn, was detached. This case came before the sages and they permitted it. Once [the people] saw that [the sages] permitted it, [the people] went and tied the tails of other firstborns together, but [the sages] forbade them. This is the rule, anything intentional is forbidden, and that which is unintentional is permitted.

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