Commentary for Bava Batra 183:4

וליחזי דמי היכי נינהו

Rab said, the [sale] is under false pretences.<span class="x" onmousemove="('comment',' Lit., 'mistaken deal', 'a purchase based on error'. An ox is usually purchased to plough or to perform similar service. The sale, therefore, took place under false pretences, and is consequently invalid, and the seller must return the purchase money. ');">⁷</span> But Samuel said: [The seller] can say to him, 'I have sold it to you for [the purpose of] slaughtering'.<span class="x" onmousemove="('comment',' Samuel is of the opinion that, in money matters, general practice is no determining factor in the validity of the sale. The seller, therefore, can claim that, despite the general practice, he has sold him the ox, not for ploughing, but for slaughter. ');">⁸</span>

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