Genesis 23:16-18

16Abraham agreed to Ephron’s terms and weighed out for him the price he had named in the hearing of the Hittites: four hundred shekels of silver, according to the weight current among the merchants. 17So Ephron’s field in Machpelah near Mamre—both the field and the cave in it, and all the trees within the borders of the field—was deeded 18to Abraham as his property in the presence of all the Hittites who had come to the gate of the city.