Commentary for Bava Batra 209:7

כור בשלשים סאה בסלע אני מוכר לך ראשון ראשון קנה אלא זו וסבירא ליה

[If a seller said.] 'I sell you a <i>kor</i> for thirty [selai'm]'. he may withdraw even at the last <i>se'ah</i>.<span class="x" onmousemove="('comment',' Because the terms of the offer implied that his desire was to sell the entire kor. So long, therefore, as the buyer has not acquired every fraction of the kor, the purchase cannot be regarded as having been legally completed. ');">¹⁸</span> [If. however, he said]. 'I sell you a <i>kor</i> for thirty, [each] <i>se'ah</i> for a <i>sela'</i>, [the buyer] acquires<span class="x" onmousemove="('comment',' By specifying the price per kor and per se'ah, the seller has intimated his consent to sell either the entire kor or any smaller quantity. ');">¹⁹</span> possession of every <i>se'ah</i> as It is measured out for him.<span class="x" onmousemove="('comment',' Lit. 'he acquires first first'. ');">²⁰</span>

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