Genesis 49:30

New International Version

the cave in the field of Machpelah, near Mamre in Canaan, which Abraham bought along with the field as a burial place from Ephron the Hittite.

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So the field and the cave in it were deeded to Abraham by the Hittites as a burial site.

Then Abraham rose from beside his dead wife and spoke to the Hittites. He said,

“I am a foreigner and stranger among you. Sell me some property for a burial site here so I can bury my dead.”

His sons Isaac and Ishmael buried him in the cave of Machpelah near Mamre, in the field of Ephron son of Zohar the Hittite,