Genesis 25:8 (KJV)

But unto the sons of the concubines, which Abraham had, Abraham gave gifts, and sent them away from Isaac his son, while he yet lived, eastward, unto the east country.

And these are the days of the years of Abraham’s life which he lived, an hundred threescore and fifteen years.

Then Abraham gave up the ghost, 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, in the field of Ephron the son of Zohar the Hittite, which is before Mamre;

The field which Abraham purchased of the sons of Heth: there was Abraham buried, and Sarah his wife.