Charles Ellicott Commentary Genesis 27:19

"And Jacob said unto his father, I am Esau thy first-born; I have done according as thou badest me: arise, I pray thee, sit and eat of my venison, that thy soul may bless me." — Genesis 27:19 (ASV)

Arise ... sit and eat. — The Hebrews at this time, and for centuries, sat at their meals (1 Samuel 20:25). It was from the Romans that they learned to recline at table, as we find was their custom in the Gospels. It is a mistake, moreover, to suppose that Isaac was a bedridden old man, for Jacob bids him arise and seat himself. Nor does he help him, though his sight was weak. It is only when commanded to draw near that he lets his father touch him.