So please allow me to put it hear
A jews guy went to a shop owned by a Muslim man and the Jews guy wanted to buy something like a thoub (Traditional dress for Qatari men), the thoub was having a defect and sales man did not tell the Jews guy about the defect and the thoub was sold for 3000 QR, when the owner of the shop came to the shop, the owner did not see the thoub and asked about the thoub, the sales man said the thoub has been sold, the owner said to the sales man did you explain the defect to the customer? The sales man said no, the owner became angry and took the 3000 QR and went to the Jews guy and told him excuse me the thoub you bought has a defect and here is the 3000 QR.
The Jews guy said to the owner but why are you doing this?
The owner said because my religion tells me to be honest and not betrayd customers. The Jews guy said and the 3000 QR which I gave to the sales man is fake ones and for your honesty here is an original 3000 QR.
The Jews guy entered Islam because of what he have seen from this honest owner.
Be honest and remember honesty will always benifit you.