Working for Someone at the Time of another Contract
Jurisprudence by Imam Khamenei;
Question: A driver carries a
consignment for a company and at the same time, another person gives
him some goods to deliver it to the destination in addition to the
company's consignment and receive a fee, but the company does not accept
it. Is there any problem with the fee?
Answer:
If the vehicle belongs to the company, the driver's action is not
permissible and he must pay the company for using its vehicle. However,
if it belongs to the driver and has concluded a contract with the
company to convey its consignment, there is no problem with the
mentioned fee provided that it does not conflict with the contract.