Genesis 44:1-3

1And he commanded him who was over his house, saying, Fill the men's sacks with food, as much as they can carry; and put every man's money in the mouth of his sack.

2And put my cup, the silver cup, in the mouth of the sack of the youngest, and his grain-money. And he did according to the word of Joseph which he had spoken.

3In the morning, when it was light, the men were sent away, they and their asses.