Sa'di says

On the Manners of Kings

... They relate that once, during a hunting exhibition, they were preparing for Nushirwan the Just some game, as roast meat. There was no salt; and they dispatched a slave to a village to bring some. Nushirwan said, "Pay for the salt you take, in order that it may not become a custom, and the village be ruined." They said, "What harm will this little quantity do?" He replied, "The origin of injustice in the world was at first small, and everyone that came added to it, until it reached this magnitude."