הַשָּׂדֶ֛ה אֲשֶׁר־קָנָ֥ה אַבְרָהָ֖ם מֵאֵ֣ת בְּנֵי־חֵ֑ת שָׁ֛מָּה קֻבַּ֥ר אַבְרָהָ֖ם וְשָׂרָ֥ה אִשְׁתּֽוֹ׃
이것은 아브라함이 헷 족속에게서 산 밭이라 아브라함과 그 아내 사라가 거기 장사되니라
Rabbeinu Bahya
The Torah speaks about this transaction no fewer than eight times in this portion, and twice more at a later date, making a total of ten references to what should be viewed as a simple transaction. [Anyone living in our own times realizes that all this was not enough to safeguard our claim to make it universally recognized. Ed.]
Radak
במערה, we have explained on Genesis 25,10 why this mention of the cave of Machpelah as the patriarchs’ burial site is mentioned so many times in the Torah as if we did not know already.