창세기 23:20의 인용 해설

your father, etc., and your mother Abraham and Sarah took their greatness from there, and the children of Heth gave her a grave.

לאברהם למקנה, “it arose” after Avraham had paid the money, a normal procedure which we are familiar with from the (misquote) in Erchin 33 ונתן הבסף וקם לו. The purchase was concluded in verse 18, i.e. the field became a מקנה for Avraham. It became an ancestral piece of property only after Sarah had actually been buried there, i.e. after the purpose of the transaction had been carried out (verse 20)

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.