Is it permissible to buy a car from Al Salam Bank in Algeria through Murabaha, where the bank buys it after adding a profit margin and it remains mortgaged to the bank until the full amount is paid?

If the bank first purchases the car, then sells it to the ordering party after it has entered its possession and responsibility, there is no objection to that. The bank's taking of a seriousness margin before the contract does not affect this, as it is a guarantee of the ordering party's seriousness. The bank is permitted to retain the seriousness margin if the client reneges on their binding promise, to the extent of the actual damage incurred. However, if the promise is fulfilled and the contract concluded, the seriousness margin must be returned to the client. Similarly, there is no objection to mortgaging the car for its price to the bank to secure its right.