gen 27:21-25
Isaac then said to Jacob, "Come closer, son, that I may feel you, to learn whether you really are my son Esau or not." So Jacob moved up closer to his father. When Isaac felt him, he said, "Although the voice is Jacob's, the hands are Esau's." (He failed to identify him because his hands were hairy, like those of his brother Esau; so in the end he gave him his blessing.) Again he asked him, "Are you really my son Esau?" "Certainly," he replied. Then Isaac said, "Serve me your game, son, that I may eat of it and then give you my blessing." Jacob served it to him, and Isaac ate; he brought him wine, and he drank.