Genesis 23:18-22

to Abraham as a possession in the presence of the sons of Heth, before all who entered the gate of his city.

After this, Abraham buried his wife Sarah in the cave of the field of Machpelah facing Mamre (that is, Hebron), in the land of Canaan.

So the field and the cave that was in it were deeded over to Abraham for a burial site by the sons of Heth.