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Ibn Ezra on the Torah
Chapter 23
Genesis 23
AND AFTER THIS, ABRAHAM BURIED SARAH: After [the burial of Sarah] the field was made sure as a burial ground possession belonging to Abraham and his descendents. Torah tells [of the purchase of the field of Machpelah] ...it informs us that G-d's word to Abraham that he would possess the land as an inheritance was fullfilled.
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