“And Isaac gave up the ghost, and died, and was gathered unto his people, being old and full of days: and his sons Esau and Jacob buried him.”
Then he breathed his last and died and was gathered to his people, old and full of years. And his sons Esau and Jacob buried him. The death notice for Isaac uses the same honorable formula as Abraham's — old and full of years, gathered to his people. And his sons Esau and Jacob buried him — together, the second time the brothers are together at a burial, after the reconciliation of Genesis 33. The application: the covenant patriarch is buried by both his sons — the reconciliation of Genesis 33 holds. Both sons stand at their father's grave.