אֶת־הַנָּכְרִ֖י תִּגֹּ֑שׂ וַאֲשֶׁ֨ר יִהְיֶ֥ה לְךָ֛ אֶת־אָחִ֖יךָ תַּשְׁמֵ֥ט יָדֶֽךָ׃
Of a foreigner thou mayest exact it; but whatsoever of thine is with thy brother thy hand shall release.
Sifrei Devarim
(Devarim 15:3) "Of the gentile shall you exact": This is a positive commandment.