Genesis 42:6-17

6And Joseph, he was the governor over the land — he it was that sold [the corn] to all the people of the land. And Joseph's brethren came and bowed down to him, the face to the earth.

7And Joseph saw his brethren, and knew them; but he made himself strange to them, and spoke roughly to them, and said to them, Whence come ye? And they said, From the land of Canaan, to buy food.

8And Joseph knew his brethren, but they did not know him.

9And Joseph remembered the dreams that he had dreamt of them; and he said to them, Ye are spies: to see the exposed places of the land ye are come.

10And they said to him, No, my lord; but to buy food are thy servants come.

11We are all one man's sons; we are honest: thy servants are not spies.

12And he said to them, No; but to see the exposed places of the land are ye come.

13And they said, Thy servants were twelve brethren, sons of one man, in the land of Canaan; and behold, the youngest is this day with our father, and one is not.

14And Joseph said to them, That is it that I have spoken to you, saying, Ye are spies.

15By this ye shall be put to the proof: as Pharaoh lives, ye shall not go forth hence, unless your youngest brother come hither!

16Send one of you, that he may fetch your brother, but ye shall be imprisoned, and your words shall be put to the proof, whether the truth is in you; and if not, as Pharaoh lives, ye are spies.

17And he put them in custody three days.