Charles Ellicott Commentary Genesis 28:1

"And Isaac called Jacob, and blessed him, and charged him, and said unto him, Thou shalt not take a wife of the daughters of Canaan." — Genesis 28:1 (ASV)

Isaac called Jacob... . — Though Rebekah’s primary motive was her concern for Jacob’s safety, yet we must not imagine that his marriage was a mere pretext. On the contrary, now that he was acknowledged as the firstborn, both he and she would have been abandoning his high position had they not arranged for the fulfilment of his duty in this respect. What is remarkable is the frankness of Isaac’s conduct. There is no attempt to substitute Esau for Jacob, nor to lessen the privileges of the latter, but with hearty cheerfulness he blesses the younger son, and confirms him in the possession of the whole Abrahamic blessing.