Prohibition of Najash, Deception, and Fraud in Buying and Selling

Question:
May Allah reward you and bless you. He says: I have seen things that are not good and are contrary to the rules among those who sell cars, including najash. What is the advice regarding this?

Answer:
It is obligatory for Muslims in general, car sellers and others, to give advice and not to deceive. The Prophet (peace and blessings be upon him) said: The Prophet (peace and blessings be upon him) forbade najash, which is when a person who does not intend to buy increases the price of the item in order to raise it for the customers. The Prophet (peace and blessings be upon him) also forbade tadlis, which is presenting the item in a way that is not its true nature, by beautifying it and dressing it up to appear sound, while it has defects inside.
This is not permissible. The Prophet (peace and blessings be upon him) once passed by a man selling food, so the Prophet (peace and blessings be upon him) put his hand into the food and found moisture at the bottom. He said: What is this, O seller of food?
It was hit by the sky, O Messenger of Allah, meaning it was hit by rain. The Prophet (peace and blessings be upon him) said: Yes.