What is the ruling on purchasing a car through murabahah from an Islamic bank, and then operating it with a third party for leasing to cover its installments, after which it is divided equally between them once the installments are paid off, or the price of half of it is taken immediately and the car fully devolves to the third party?

There is no objection to purchasing a car through a bank using the Murabaha system if the Sharia conditions are met. It is permissible to operate the car with a third party, but an agreement that their wage will be half the car or a portion of it after the installments are paid off is not valid due to gharar (uncertainty) and jahalah (ignorance) concerning the wage. Selling half of the car to a third party when it is mortgaged to the bank is not valid except with the bank's permission, and it is not permissible to make half of it a wage for the worker after the installments are paid off.