Midrash su Salmi 80:1

Now Jacob saw that there was corn in Egypt (Gen. 42:1). Scripture states elsewhere in allusion to this verse: He that withholdeth corn, the people shall curse him; but blessing shall be upon the head of him that selleth it (Prov. 11:26). He that withholdeth corn, the people shall curse him refers to Pharaoh, whom the people cursed for hiding the corn during the years of famine. Blessings shall be upon the head of him that selleth it alludes to Joseph, who fed the people during the years of famine. David said concerning him: Give ear, O Shepherd of Israel, Thou leadest Joseph like a flock; Thou that art enthroned upon the cherubim, shine forth (Ps. 80:1). When a famine occurred during the lifetime of David, he pleaded to the Holy One, blessed be He, for mercy, saying: “Master of the Universe, tend your flock as did Joseph, who fed the world through years of famine.”

Rabbi Phineas said: The Holy Spirit rested on Joseph from his youth; and it led him in all matters of wisdom like a shepherd who leads his flock, as it is said, "Give ear, O Shepherd of Israel, thou that leadest Joseph like a flock, thou that sittest upon the cherubim" (Ps. 80:1). In all his wisdom a certain woman enticed (him), and when he wished to accustom himself to sin, he saw the image of his father, and repented concerning it.