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).

[If] one hires craftsmen, and they mislead one another, they have nothing but resentment against one another.  [If] he hired a donkey driver or a wagoner to bring wood for a litter or flutes for a bride or for a dead person, or laborers to remove his flax from the steeping water, or anything which may cause a loss, and they retracted —- in a place where there are no people, he may hire [other workers] in addition to them, or trick them.