'Grain money' in the Bible

Take double the [amount of] money with you, and take back the money that was returned in the opening of your sacks; perhaps it was an oversight.

Then the men took the present, and they took double the [amount of] money with them, and Benjamin; then they left and went down to Egypt and stood before Joseph.

And 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.