The following transgress a negative commandment: the lender, the borrower, the guarantor, and the witnesses. And the Sages say: Even the scribe. They transgress: You shall not give (Leviticus 25:37), You shall not take from him (Leviticus v. 36), You shall not be to him as a creditor (Exodus 22:24), You shall not impose interest upon him (ibid.), and And before a blind man you shall not place a stumbling block, and you shall fear your God; I am Hashem (Leviticus 19:14).