Genesis 44:8 (KJV)

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 he overtook them, and he spake unto them these same words.

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

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.

And he searched, and began at the eldest, and left at the youngest: and the cup was found in Benjamin's sack.

Then they rent their clothes, and laded every man his ass, and returned to the city.