Genesis 28:6

“And when Esau saw that Isaac had blessed Jacob, etc.] Had conferred the blessing before given, or had wished him a good journey; which perhaps may be all that Esau understood by it, and so was not so much offended with it: and sent him away to Padanaram, to take him a wife from thence; which likewise might not be displeasing to him, partly as he understood it to be only on account of taking a wife, and not on account of his ill design upon him, which he might imagine his parents knew nothing of; and partly as he would now be out of the way, and he might find means the easier to ingratiate himself into his father’s favour, and get him to revoke the blessing, and settle the inheritance upon…”

“when Esau saw that Isaac had blessed Jacob, &c.--Desirous to humor his parents and, if possible, get the last will revoked, he became wise when too late (see Mat 25:10), and hoped by gratifying his parents in one thing to atone for all his former delinquencies. But he only made bad worse, and though he did not marry a "wife of the daughters of Canaan," he married into a family which God had rejected. It showed a partial reformation, but no repentance, for he gave no proofs of abating his vindictive purposes against his brother, nor cherishing that pious spirit that would have gratified his father--he was like Micah (see Jdg 17:13).”

“28:6-9 Esau, the unchosen son still trying to please his father, married a woman from the unchosen line of Ishmael, which he thought would be more acceptable. He did not understand the uniqueness of the covenant family.”