And with the same chain of narration (it is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him) that the Messenger of Allah, peace and blessings be upon him, said: "Do not go out to meet traders bringing goods from outside before they reach the market to buy their goods, and none of you should make a deal over the deal of his brother, and do not bid falsely (to deceive), and a townsman should not sell for a villager, and do not withhold the milk in the udders of camels and goats (to deceive buyers). Then, if someone buys such an animal after that, he has two options after milking it: if he likes it, he may keep the animal (and the deal remains), and if he dislikes it, he may return the animal along with a sa' (measure) of dates."

And with the same chain of narration (it is narrated from Sayyiduna Ibn Umar, may Allah be pleased with them both) that a man was mentioned before the Messenger of Allah, peace and blessings be upon him, who used to be deceived in buying and selling. So the Messenger of Allah, peace and blessings be upon him, said to him: "When you sell something, say: 'There is no deception.'" Then, whenever that man sold something, he would say: "There is no deception."

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Do not sell gold for gold except equal for equal, and do not give some of it more than the other; and do not sell silver for silver except equal for equal, and do not give some of it more than the other; and do not sell any of these things for deferred payment in exchange for immediate payment."