Genesis 23:17-20

So Ephron’s field in Machpelah, east of Mamre, was sold. Abraham became the owner of the field, the cave in it, and all the trees that were in the field. The sale was made at the city gate, with the Hittites as witnesses. After this, Abraham buried his wife Sarah in the cave in the field of Machpelah, near Mamre. (Mamre was later called Hebron in the land of Canaan.) So Abraham bought the field and the cave in it from the Hittites to use as a burying place.