Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[95] Now Jacob also, when he understood that foreigners might come, sent all his sons into Egypt to buy corn, for the land of Canaan was grievously afflicted with the famine; and this great misery touched the whole continent. He only retained Benjamin, who was born to him by Rachel, and was of the same mother with Joseph. These sons of Jacob then came into Egypt, and applied themselves to Joseph, wanting to buy corn; for nothing of this kind was done without his approbation, since even then only was the honor that was paid the king himself advantageous to the persons that paid it, when they took care to honor Joseph also. Now when he well knew his brethren, they thought nothing of him; for he was but a youth when he left them, and was now come to an age so much greater, that the lineaments of his face were changed, and he was not known by them: besides this, the greatness of the dignity wherein he appeared, suffered them not so much as to suspect it was he. He now made trial what sentiments they had about affairs of the greatest consequence; for he refused to sell them corn, and said they were come as spies of the king's affairs; and that they came from several countries, and joined themselves together, and pretended that they were of kin, it not being possible that a private man should breed up so many sons, and those of so great beauty of countenance as they were, such an education of so many children being not easily obtained by kings themselves. Now this he did in order to discover what concerned his father, and what happened to him after his own departure from him, and as desiring to know what was become of Benjamin his brother; for he was afraid that they had ventured on the like wicked enterprise against him that they had done to himself, and had taken him off also.