לֹא־תַשִּׁ֣יךְ לְאָחִ֔יךָ נֶ֥שֶׁךְ כֶּ֖סֶף נֶ֣שֶׁךְ אֹ֑כֶל נֶ֕שֶׁךְ כָּל־דָּבָ֖ר אֲשֶׁ֥ר יִשָּֽׁךְ׃
Thou shalt not lend upon interest to thy brother: interest of money, interest of victuals, interest of any thing that is lent upon interest.
Read kabbalistic (mystical) interpretation of Deuteronomy 23:20: and classical mystical sources.