Is it permissible to pay an extra amount to a worker in a car workshop to expedite the repair?

Question:
He says: Honorable Shaykh, may Allah grant you success. The questioner says: I have a car in the workshop, and the worker said he would repair it for me for three thousand riyals and it would be finished in a week. So I said, I will give you an extra five hundred for you, on the condition that you get it out within two days. Did I do something wrong? Is this of the forbidden bribe?

Answer:
Yes, this is not permissible. This is a worker who has a salary; his salary is sufficient for him, and you should not give him anything. You would ruin it for the other people who are waiting for a bribe from others as well, and you would ruin it for the one in charge of the work as well. This is not permissible. Then, it is not permissible to combine the work with the time, meaning within five days or four days; this is not permissible because he may not be able to commit to this.