קבלה על בראשית 27:37

"Behold, I have made him your lord...and what shall I do now for you, my son" (Beresheet 27:37). This means that there is no one present who gives consent, "What shall I do now for you, my son." He then blessed him in this world. He looked at his grade and said to him "and by your sword shall you live," for it is fitting of you to shed blood and wage wars. Therefore he said, "What shall I do now for you, my son".