God says
… he who deceives shall be faced with his deceit on the Day of Resurrection, when every human being will be paid in full for whatever he has done, and none shall be wronged. -- Q.3:161
O you who have attained to faith! Do not devour one another’s possessions wrongfully – not even by way of trade based on mutual agreement … Q.4:29
You are obsessed by greed more and more until you go down to your graves.* -- Q.102:1,2
* The Arabic term “takasur” bears the connotation of “greedily striving for an increase,” i.e., in benefits, be they tangible or intangible, real or illusory. In the context it denotes man’s obsessive striving for more and more comfort, more and more materials goods, greater power over his fellowmen, or over nature, and unceasing technological progress. A passionate pursuit of such endeavors to the exclusion of everything else, bars man from all spiritual insights, and hence from the acceptance of any restrictions and inhibition based on purely ‘moral’ values -- with the result that not only individuals but whole societies gradually lose all inner stability and, thus, all chance of happiness.
Prophet said
Ali reported that the Messenger of God forbade purchase from a needy person (talking advantage of his need)… Abu Daud.
“Whoever sells a defective thing without disclosing the defect continues to be in the wrath of God.” – H: Ibn.Majah. N: Waselah-b-Asqa’a.
Abu Hurairah reported that the Messenger of God passed by a heap of corn. He thrusted his hands into it and his hands touched the moisture. He asked, “O owner of this corn, what is this?”. The owner replied: the rain fell on it, O holy Prophet. “(why) have you not turned-over the corn like this so that people could see it,” said the Messenger of God, “Whoever deceives is not of me.”-- H: Muslim.
“Nobody shall bargain over the bargain of his brother Muslim”* -- H: Muslim. N: Abu Hurairah.
* ‘Nobody’ refers to Muslim as well as non-Muslim, coming forward, offering higher price after an agreement of sale and purchase has been reached with someone else.
