Genesis 27:1

And it came to pass that when Isaac was old, and his eyes were dim, so that he could not see, he called Esau, his eldest son, and said unto him, My son; and he said unto him, Behold, here am I. Isaac was by this time one hundred and thirty-seven years old, and the infirmities of old age were beginning to show themselves in his failing eyesight; literally, in his eyes becoming weak away from seeing. He now, in a formal and solemn manner, called for Esau, his favorite son.