Sforno on Genesis 24:5/ספורנו על בראשית כ״ד:ה׳

1אשר יצאת משם, a place which you had despised. If I now swear to you to take a wife from there and the girl I choose refuses to come here, my betrothing her to your son will obligate him to fulfill his conjugal duties including living with her as husband and wife. If he refuses to join her there he will have become guilty of betrayal of his bride. Shall I really bring him back there?