What is the ruling regarding the 850 dinars remaining with the employee, which he took in excess of the salary transferred to the deceased prisoner? Is it permissible (halal), forbidden (haram), or is any part of it permissible for him, knowing that he does not know any of the deceased's family and cannot repay the full amount?

The apparent meaning of the question is that the prisoner hired a prison employee to process a salary transfer for him, then they disagreed on the wage, and the prisoner died before paying it. The employee must first repent to Allah for not returning the surplus in the prisoner's account, which is considered a trust (amanah).

As for the wage: 1. If they agreed on a specific wage, the employee takes it from the surplus and returns the remainder to the prisoner's heirs. If the heirs cannot be reached, the remainder should be given as charity to the poor. 2. If they did not agree on a specific wage, the employee is entitled to a customary wage (the average amount that others in similar positions would take for this work) from the surplus, and the remainder should be returned to the heirs or given as charity. 3. If the work performed by the employee was unlawful (haram) (such as obtaining an interest-based insurance card), then he is not entitled to any wage, and he must dispose of the entire surplus (850 dinars) by returning it to the prisoner's heirs or giving it as charity.