Who buried Abraham with Isaac?

Genesis 25:8-10 - Then Abraham breathed his last and died in a good old age, an old man and full of years, and was gathered to his people. And his sons Isaac and Ishmael buried him in the cave of Machpelah, which is before Mamre, in the field of Ephron the son of Zohar the Hittite, the field which Abraham purchased from the sons of Heth. There Abraham was buried, and Sarah his wife. [NKJV]