Sforno on Genesis 27:37/ספורנו על בראשית כ״ז:ל״ז

1ואת כל אחיו נתתי לו לעבדים, a reference to the sons of Ishmael, and the sons of Keturah, as well as the kings of other nations. As he had said in verse 29. יעבדוך עמים, “nations will serve you.”

2ולך איפוא מה אעשה?, in view of this what can I do now for you? What kind of blessing is left which will be of use to you?