Genesis 25:9-10

9His sons, Isaac and Ishmael, buried his body in the cave of Machpelah. That was near Mamre. The cave is in the field that belonged to Zohar's son, Ephron. He was a Hittite.

10Abraham had bought the field from the Hittites. So they buried Abraham there. It was in the cave where his wife, Sarah, had also been buried.