Midrash su Genesi 41:9

And, behold, there came up out of the river seven kine (Gen. 41:2) After he (Pharaoh) had his dream, he summoned all his magicians. Whereupon the Holy Spirit called out: Where are they, then, thy wise men? (Isa. 19:12). Since they were unable to interpret the dream, the cup-bearer came forward and said: I make mention of my faults this day … And there was with us there a young man, a Hebrew, servant to the captain (Gen. 41:9–12). Accursed are the wicked, for even the good they do is accompanied by evil. For he said a young man, as though describing a callow youth without understanding; a Hebrew, as if to suggest that he was different from them; and a slave, an expression of contempt. Furthermore, it is written in Pharaoh”s constitution that a slave was not permitted to rule over them.

And still others among them said unto the king according to these words: The seven fat cows ‎are seven sons, who shall be slain in the latter days by seven sons of thy princes; and the ‎seven rank ears which thou hast seen in thy second dream are the same seven princes who ‎will be smitten by seven less powerful princes in the latter days, who will avenge on them the ‎cause of thy sons, and thus the government will once more be turned over to thy seed. And ‎the king heard all the words of these wise men, and the various interpretations of his dreams ‎none of them found favor in the eyes of the king, for the king knew in his wisdom that neither ‎of them hath spoken correctly. And this came from the Lord to pervert the words of these ‎wise men in order that Joseph be brought from the prison house to attain greatness in Egypt. ‎And when the king saw that not one among the wise men and the magicians had spoken the ‎correct words the anger of the king was exceedingly aroused and his wrath burned within him. ‎And the king commanded that all the wise men and the magicians be led away from him, and ‎all of them went away from the presence of the king in shame and contempt, and the king ‎commanded further that it be proclaimed throughout the land of Egypt that all the magicians in ‎Egypt should be slain so not one of them be left alive. And the officers of the king's guard rose ‎up and all of them drew their swords and they began smiting the magicians of Egypt and her ‎wise men. And after this Marod, the chief butler of the king, appeared and bowed down ‎before the king, and seated himself before him. And the chief butler said unto the king: May ‎the king live forever, and may his kingdom beenlarged in the land. Thou hast been angry at thy ‎servant, now two years since, and thou hast placed me into confinement, and I was ‎imprisoned for some time together with the chief baker. And there was with us in the ‎dungeon a Hebrew slave, belonging to the prince of the guards, and his name is Joseph; for his ‎master became angry with him and he placed him into the prison house, where he attended ‎upon us. And after we had been in prison for some days we dreamed dreams in the same ‎night, I and the chief baker. We dreamed each man according to the interpretation of his ‎dream. And in the morning we came to that slave and we told unto him our dreams, and he ‎interpreted them correctly, to each man according to his dream. And his interpretation was ‎fulfilled, not the least of all his words fell to the ground. And now, oh my lord and king, do not ‎slay the men of Egypt without cause! Behold the same slave is still confined in the prison ‎house of the prince of the guards, and if it please the king send for him, and let him appear ‎before thee and he will make known unto thee the correct interpretation of the dream thou ‎hast dreamed.‎