Reference for Bava Batra 5:5
הַמּוֹכֵר רֹאשׁ בְּהֵמָה גַסָּה, לֹא מָכַר אֶת הָרַגְלָיִם. מָכַר אֶת הָרַגְלַיִם, לֹא מָכַר אֶת הָרֹאשׁ. מָכַר אֶת הַקָּנֶה, לֹא מָכַר אֶת הַכָּבֵד. מָכַר אֶת הַכָּבֵד, לֹא מָכַר אֶת הַקָּנֶה. אֲבָל בְּדַקָּה, מָכַר אֶת הָרֹאשׁ, מָכַר אֶת הָרַגְלָיִם. מָכַר אֶת הָרַגְלַיִם, לֹא מָכַר אֶת הָרֹאשׁ. מָכַר אֶת הַקָּנֶה, מָכַר אֶת הַכָּבֵד. מָכַר אֶת הַכָּבֵד, לֹא מָכַר אֶת הַקָּנֶה:
One who sells the head of a large beast has not sold the feet. [In the Tosefta it is stated: Where is this so? Where they are not accustomed to do so. But where they are, "all is according to the custom of the land."] If he sold the feet, he has not sold the head. If he sold the windpipe [i.e., the lung, so called because of its windpipe], he has not sold the liver. If he sold the liver, he has not sold the lung. But in a small animal, if he sold the head, he has sold the legs; if he sold the legs, he has not sold the head. If he sold the windpipe, he has sold the liver; if he sold the liver, he has not sold the windpipe.
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