Genesis 49:32

The purchase of the field and of the cave that is therein was from the children of Heth.

The purchased field with its cave is the cave of Machpelah at Hebron. That cave is the burial place of the patriarchs, as identified in Genesis 49:29-32. Hebron, where this field and cave lie, was also called Mamre and had earlier been known as Kirjath-arba.