What is the ruling on an accountant working outside his country for a company that might deal in usury without his knowledge, and is he required to leave his job after discovering that, given that he has a three-year contract, and knowing that the company's primary activity is not usurious but there are suspicions regarding some of its transactions?

The accountant must inquire about the nature of the work before accepting it. If it involves accounting for usurious transactions, then it is not permissible for him. If the company mixes permissible and impermissible dealings in its work, he is only permitted to account for the permissible transactions. It is not lawful for him to accept accounting for usury, even if it leads to him leaving the job, because the Prophet (peace be upon him) cursed the one who consumes usury, the one who feeds it, its scribe, and its two witnesses. The accountant falls under the ruling of the scribe and the witness. Every corrupt contract is considered usury.