'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.

Put my [personal] cup, the silver cup, in the mouth of the sack of the youngest, with his grain money.” And the steward did as Joseph had told him.