And he came unto his father,—by this time a bed-ridden invalid (vide Genesis 27:19)—and said, My father. If he attempted to imitate the voice of Esau, he was manifestly unsuccessful; the dull ear of the aged patient was yet acute enough to detect a strangeness in the speaker's tone.
And he said, Here am I who art thou, my son? "He thought be recognized the voice of Jacob; his suspicions were aroused; he knew the crafty disposition of his younger son too well; and he felt the duty of extreme carefulness" (Kalisch).