Reference for Pesachim 4:3

מְקוֹם שֶׁנָּהֲגוּ לִמְכֹּר בְּהֵמָה דַקָּה לַגּוֹיִם, מוֹכְרִין. מְקוֹם שֶׁנָּהֲגוּ שֶׁלֹּא לִמְכֹּר, אֵין מוֹכְרִין. וּבְכָל מָקוֹם אֵין מוֹכְרִין לָהֶם בְּהֵמָה גַסָּה, עֲגָלִים וּסְיָחִים שְׁלֵמִין וּשְׁבוּרִין. רַבִּי יְהוּדָה מַתִּיר בִּשְׁבוּרָה. בֶּן בְּתֵירָה מַתִּיר בְּסוּס:

In a place where it was the custom to sell a small animal to idolators, they (are permitted) to sell. In a place where it was the custom not to sell, [where they were stringent with themselves, lest they come to sell a large one], they do not sell. And in all places it is not permitted to sell a large animal to them, [the rabbis having decreed (against it) lest he lend or rent his beast to an idolator (who might work with it on Shabbath), and a Jew is exhorted vis-à-vis the resting of his animal (on the Sabbath). Or else, sometimes he might sell it on Sabbath eve towards dark and shout to his beast so that it follow the purchaser, which if the beast does because it recognizes his voice, he is found to be "mechamer" ("driving") his beast on the Sabbath.] (And it is not permitted to sell them) calves or young asses, sound or broken, [For though they cannot be worked, they (i.e., selling them) might come to be confused with the selling of large beasts. R. Yehudah permits selling an unsound beast, [which will never be fit to be worked; but he concurs that it is forbidden to sell calves or young asses, for when they are grown, they will be fit for work. The halachah is not in accordance with R. Yehudah.] Ben Betheirah permits selling a horse, [since it is used for riding, and "a living person carries himself." The halachah is not in accordance with Ben Betheirah. And one may sell a beast through an agent when he (the owner) is not present at the time of the sale. For there is no reason to fear that he (the agent) will come to lend or rent it, it not being his. Nor is there any reason to fear that he will be in transgression of mechamer, the animal not recognizing his voice.]

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