Because Isaac had a taste for wild game
- Genesis 27:4,19,25,31
4Then prepare a tasty dish that I love and bring it to me to eat, so that I may bless you before I die.” … 19Jacob said to his father, “I am Esau, your firstborn. I have done as you told me. Please sit up and eat some of my game, so that you may bless me.” … 25“Serve me,” said Isaac, “and let me eat some of my son’s game, so that I may bless you.” Jacob brought it to him, and he ate; then he brought him wine, and he drank. … 31He too made some tasty food, brought it to his father, and said to him, “My father, sit up and eat of your son’s game, so that you may bless me.”
but Rebekah loved Jacob
- Genesis 27:6
6Rebekah said to her son Jacob, “Behold, I overheard your father saying to your brother Esau,