וַיָּ֣קָם ׀ שְׂדֵ֣ה עֶפְר֗וֹן אֲשֶׁר֙ בַּמַּכְפֵּלָ֔ה אֲשֶׁ֖ר לִפְנֵ֣י מַמְרֵ֑א הַשָּׂדֶה֙ וְהַמְּעָרָ֣ה אֲשֶׁר־בּ֔וֹ וְכָל־הָעֵץ֙ אֲשֶׁ֣ר בַּשָּׂדֶ֔ה אֲשֶׁ֥ר בְּכָל־גְּבֻל֖וֹ סָבִֽיב׃
So the field of Ephron, which was in Machpelah, which was before Mamre, the field, and the cave which was therein, and all the trees that were in the field, that were in all the border thereof round about, were made sure
Rashi on Genesis
ויקם שדה עפרון AND THE FIELD OF EPHRON WAS MADE SURE (literally, it rose) — It received a rise in importance because it passed from the possession of a commoner (הדיוט an ordinary person) into the possession of a king (Genesis Rabbah 58:8). But the real meaning of the verse is: The field and the cave that was therein and all the trees … became secured to Abraham as a possession etc. (i. e. verse 17 is an incomplete sentence and must be read together with verse 18, thus: ויקם השדה וגו… לאברהם למקנה —The field etc. became secured to Abraham as a possession).
Sforno on Genesis
ויקם השדה לאברהם למקנה, the word ויקם teaches that the purchase was confirmed by a sealed document
Radak on Genesis
ויקם, it “arose” for Avraham as a purchase, and acquisition. The unusual sounding word קם here also occurs in this sense in Leviticus 27,19 וקם לו, where it describes the legal procedure of redeeming property from the Temple treasurer by paying a premium. The term is chosen to describe a transaction of a permanent, enduring nature.