Adam Clarke on Hebrews 11:20

By faith Isaac blessed Jacob and Esau - He believed that God would fulfill his promise to his posterity; and God gave him to see what would befall them in their future generations. The apostle does not seem to intimate that one should be an object of the Divine hatred, and the other of Divine love, in reference to their eternal states. This is wholly a discovery of later ages. For an ample consideration of this subject, see the notes on Genesis 27 (note).