וַיְצַ֣ו יוֹסֵ֗ף וַיְמַלְא֣וּ אֶת־כְּלֵיהֶם֮ בָּר֒ וּלְהָשִׁ֤יב כַּסְפֵּיהֶם֙ אִ֣ישׁ אֶל־שַׂקּ֔וֹ וְלָתֵ֥ת לָהֶ֛ם צֵדָ֖ה לַדָּ֑רֶךְ וַיַּ֥עַשׂ לָהֶ֖ם כֵּֽן׃
Y mandó José que llenaran sus sacos de trigo, y devolviesen el dinero de cada uno de ellos, poniéndolo en su saco, y les diesen comida para el camino: é hízose así con ellos.
Alshekh
One of them opened his sack. Yoseif had ordered that Leivi’s money be placed where he would find it immediately in order to cause him anguish.
Ramban
AND TO GIVE THEM PROVISION FOR THE WAY. The reason for saying this is so that they should not consume the food which they bought in the course of the journey. He informed them of this for he gave them the provisions for the journey in a kindly fashion so that they should be able to bring the brother [Benjamin] to him, for he said, “I have no intention of harming you if your words are verified.”
Sforno
ולהשיב את כספיהם, and to restore their money. The plural mode in the word does not apply to the collective term כסף, money, but to the coins which together made up the money.