Genesis 44:6 (KJV)

And he commanded the steward of his house, saying, Fill the men's sacks with food, as much as they can carry, and put every man's money in his sack's mouth.

And put my cup, the silver cup, in the sack's mouth of the youngest, and his corn money. And he did according to the word that Joseph had spoken.

As soon as the morning was light, the men were sent away, they and their asses.

And when they were gone out of the city, and not yet far off, Joseph said unto his steward, Up, follow after the men; and when thou dost overtake them, say unto them, Wherefore have ye rewarded evil for good?

Is not this it in which my lord drinketh, and whereby indeed he divineth? ye have done evil in so doing.

And they said unto him, Wherefore saith my lord these words? God forbid that thy servants should do according to this thing:

Behold, the money, which we found in our sacks' mouths, we brought again unto thee out of the land of Canaan: how then should we steal out of thy lord's house silver or gold?

With whomsoever of thy servants it be found, both let him die, and we also will be my lord's bondmen.

And he said, Now also let it be according unto your words: he with whom it is found shall be my servant; and ye shall be blameless.

Then they speedily took down every man his sack to the ground, and opened every man his sack.