Is it necessary for a seller of car spare parts to mention the source of his imported goods from Taiwan and China, or is it sufficient for him to say that they are not original?

Truthfulness in selling is obligatory, while lying and deception are forbidden. Therefore, if the buyer asks about the source of the merchandise, it is not permissible to conceal it; rather, it is obligatory to inform him. This is because concealing the source is considered deception and hiding a defect in the commodity, and it may affect the decision to purchase. "And whoever fears Allah - He will make for him a way out and will provide for him from where he does not expect."