EXOD695 It is a negative commandment to have no part in dealings between a lender and a borrower at interest for Scripture says, neither shall you put interest upon him [this verse] – which means that one should not be a guarantor or a witness between them; and the lender is also included in the scope of this prohibition, apart from the injunction not to lend at interest to a member of Jewry. Any intermediary between them [who brings them together or helps them arrange the loan] violates the injunction, nor shall you put a stumbling-block before the blind (Ya-yikra 19:14).