'Sack's' in the Bible

And as one of them opened his sack to give his ass provender in the inn, he espied his money; for, behold, it was in his sack's mouth.

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.