Am I obligated to pay rent for an additional six months after permanently leaving Saudi Arabia and leaving the furniture in the apartment, knowing that there is a clause in the contract that requires me to pay overdue rent before moving the belongings?

Leasing is divided into binding and non-binding. Non-binding leasing is that in which a contract is made for a daily, monthly, or annual period (such as by the month, by the day, or by the year). This type of contract can be dissolved by either party at any time, unless the renter has paid the rent for the period or has begun the period, in which case the contract becomes binding. If the contract is annual, it is obligatory to complete the year unless the landlord agrees otherwise. The presence of furniture in the apartment keeps it in the renter's name, and he remains liable for the rent as long as his belongings are in it. He must return to vacate it or appoint someone to do so.