Commentary for Avodah Zarah 31:6
בשלמא תורת כלי זיין איכא דקטיל בסחופיה אלא תורת בהמה גסה מאי היא אמר רבי יוחנן לכשיזקין מטחינו ברחיים בשבת א"ר יוחנן הלכה כבן בתירא
It makes sense regarding the prohibition of weapons, for there are [horses] which kill by trampling, but the prohibition of large cattle, how does that apply? Yohanan said: When the horse gets old, they will make him grind on a mill on Shabbat. Yohanan said: The halakhah follows Ben Batera.
Daf Shevui to Avodah Zarah
The prohibition of selling weapons applies to a horse, for a horse can kill by trampling. Indeed, it seems quite clear that horses are used as weapons. But the prohibition of selling large cattle is more difficult to explain, for as I said above, the rabbis do not consider carrying a human to be prohibited by the Torah. R. Yohanan answers that when the animal grows old it will be made to work in a mill, which is considered work.
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