פּירוש אויף בראשית 23:20

ויקם השדה, “this formulation uses the verb קום in the sense of being stable, remaining firmly established. Examples are Numbers 30,10 where it refers to the validity until honoured, of a vow made by a woman of age and not married. In this instance, the Torah records that the transfer of the cave and field adjoining Machpelah from Efron to Avraham remains valid forever. Avraham himself, of course, also acquired the legal right to be buried alongside his beloved wife Sarah.

ויקם...מאת בני חת, All the townspeople had agreed to the sale of Efron’s fields to Avraham. They were quite keen for Avraham to own an ancestral plot in their midst.

מאת בני חת ויקם השדה, these people all agreed to the transaction.