Genesis 23:17-20

17So 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 18unto Abraham for a possession in the presence of the children of Heth, before all that went in at the gate of his city. 19And after this, Abraham buried Sarah his wife in the cave of the field of Machpelah before Mamre (the same is Hebron), in the land of Canaan. 20And the field, and the cave that is therein, were made sure unto Abraham for a possession of a burying-place by the children of Heth.