וַיֹּ֤אמֶר יוֹסֵף֙ הָב֣וּ מִקְנֵיכֶ֔ם וְאֶתְּנָ֥ה לָכֶ֖ם בְּמִקְנֵיכֶ֑ם אִם־אָפֵ֖ס כָּֽסֶף׃
Y José dijo: Dad vuestros ganados, y yo os daré por vuestros ganados, si se ha acabado el dinero.
Haamek Davar on Genesis
If there is no more money. He did not believe them, so he told them to bring their livestock as a test, knowing they would rather part with money than their animals.