It is told that a righteous man worked in the cloth trade, and was accustomed every year to buying garments and selling them to whoever wanted, and unlike others, he always instructed his workers to tell customers about defects in the fabrics if they found them before buying them.
One day a Jewish man came to his shop and bought a defective garment, and the merchant was not present at that time but one of his workers, and he did not care to inform the Jew about the defect because he was not a Muslim. When the owner of the shop arrived and saw that the garment was not present, he asked him about it, so the worker told him that he had sold it to the Jew for three thousand dirhams without informing him of its defect.
The merchant became angry and asked him about the place of the Jew, so the worker told him that he had left with his caravan, so the merchant took nothing but the money with him and followed the caravan for three days until he caught up with it and met the Jew. When he saw him, he said to him: oh you, you have bought from my shop a garment whose color is such and its shape is such, this garment is defective, take your dirhams and give me the garment!
The Jew wondered about that merchant who followed him on a long journey to return his money to him and retrieve his defective garment, and said to him tell me oh man: what made you do this? So the man said Islam made me committed to honesty and not deceiving, for our noble Messenger, peace be upon him, says: (whoever deceives us is not from us) the Messenger of God spoke the truth.
So the Jew said with shame from himself: oh man I bought the garment from you with counterfeit dirhams, here are these three thousand authentic ones, and more than this: I bear witness that there is no god but God and that Muhammad is the Messenger of God, for the Jew embraced Islam through the merchant’s trustworthiness and honesty, and became one of the masses of Muslims.
The moral value learned: Commitment to the teachings of religion and its values is the best means of spreading true Islam, and correcting the wrong view that non-Muslims have about it. Therefore we must pursue trustworthiness and honesty in all our words and deeds, for Muslims are the mirror of Islam, and their actions are what reflect its principles and entrench its values in others, making him desire it or be repelled by it.