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  • AlGhazalisIhya-Book_of_Ethics_of_Earning_a_Livelihood, page : 14

hand to hand until the harm is general and the corruption has spread
everywhere. So the sin of all of them goes back to the one who started it. The
Prophet, praise and peace be upon him, said: “Whoever originates a bad deed,
then the people work with it after him, he will carry the sin of it and the like of all
those who worked with it, and this will not diminish from them any of their sin.”

Someone said: “Spending one forged dirham is worse than stealing one hundred
dirhams because theft is one sin, which is committed in one action, but spending
a forged coin is an invention against the religion and it is a bad deed, which
others will work with, so the sin of it will be upon him after his death for a hundred
or two hundred years or more until that forged coin is no more.”

Second Part

Harm Specific to the Dealer

The overall rule is that he should not love for his brother except what he loves for
himself, so whatever he dislikes to deal with for himself he should not deal with
for the others.