Is the shop owner who hires a specialized employee liable for the specialized employee's negligence?

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The owner of the shop who acts as a general contractor (Ajir Mushtarak) and hires a specialized employee (Ajir Khass) to perform the work is liable to the original client for any damage caused by the specialized employee during the execution of the entrusted task. This is because the shop owner is considered the general contractor responsible for the entire job.