One of the companions of the Noble Prophet (S) said to him: “I always tend to suffer losses in my business transactions. The guile and deception of the sellers or the purchasers act like magic and leave me cheated.”
The Noble Prophet (S) advised: “In every transaction in which you fear that you might be deceived, demand from the person with whom you are doing business with the right to annul the transaction within a period of three days. This is for the reason that should you happen to suffer losses, you would be able to take back your money. In addition, be patient and forbearing in the course of the transaction.
“Do know that contemplation and patience are from Allah, while hastiness and impetuosity are from Shaitan. You can learn this lesson from a dog, for when you throw a piece of bread to a dog, it does not immediately begin to eat it but first smells it and after finding it to be appropriate, begins eating it; similarly, you should smell every matter that comes up before you (i.e. reflect and ponder over the pros and cons of it and do not embark upon it without the preliminaries). You, with your intellect and wisdom, are no less than a dog; thus, contemplate and reflect before every action.”( Riwayat-ha Wa Hikayat-ha, Page 195; Dastan-ha-e-Mathnawi, Volume 2, Page 125 )