Genesis 49:30
It's the cave in the field near Mamre at Machpelah in the land of Canaan that Abraham bought to serve as a cemetery.
Genesis 23:8-9
and addressed them, "If you are willing that I should bury my dead out of my sight, listen to me and make a request of Zohar's son Ephron on my behalf.
Genesis 23:16-18
Abraham agreed with Ephron, so he weighed out to Ephron the money to which he had agreed publicly while the Hittites were listening: 400 shekels of silver at the current merchant rate.
Genesis 23:20
And so the field with its cave was deeded by the Hittites to Abraham as a burial site.