Is it permissible to leave work for prayer or to buy food, while there is another employee who is performing the work by agreement with him?

If the intention for prayer is to perform it at the workplace without leaving for congregational prayer, then its time is legally excluded from working hours. However, leaving for congregational prayer is not permissible for an employee unless there is a condition, custom, or permission from the employer. Eating food without leaving is excluded from working hours, but leaving to buy food is overlooked if it cannot be prepared before work or if someone else can be delegated to buy it. It is not permissible for an employee to delegate a colleague at work for any matter without the employer's permission.