Gen 23:17-20

17So the field of Ephron in Machpelah, which was to the east of Mamre, the field with the cave that was in it and all the trees that were in the field, throughout its whole area, passed18to Abraham as a possession in the presence of the Hittites, in the presence of all who went in at the gate of his city.19After this, Abraham buried Sarah his wife in the cave of the field of Machpelah facing Mamre (that is, Hebron) in the land of Canaan.20The field and the cave that is in it passed from the Hittites into Abraham's possession as a burying place.