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 standard of the merchants.

17So Ephron’s field at Machpelah near Mamre, the cave that was in it, and all the trees within the boundaries of the field were deeded over 18to Abraham’s possession in the presence of all the Hittites who had come to the gate of his city.