Do not envy one another, do not raise prices by overbidding against one another, do not hate one another, do not turn your backs on one another, and do not undercut one another in trade; and be, O slaves of Allah, our brothers

The Prophet (may Allah's peace and blessings be upon him) advised the Muslim to be kind to his fellow Muslims and outlined some of the duties and etiquettes he is required to observe toward them, including the following: First advice: Do not envy one another by wishing others may lose the blessings they have. Second: Do not raise prices by overbidding against one another. By doing so, a person does not really want to buy the commodity, except to benefit the seller or harm the buyer. Third: Do not hate one another. It is the intention to cause harm, as opposed to love, unless hatred is for the sake of Allah Almighty, which is obligatory. Fourth: Do not turn your backs on each other, forsaking and abandoning one another. Fifth: Do not undercut one another in trade. It is when a person says to someone who bought a commodity: I have the like of it at a lower price or a higher-quality commodity at the same price. Then, the Prophet (may Allah's peace and blessings be upon him) gave comprehensive advice, saying: Be like brothers, by abandoning the aforementioned prohibitions and showing cordiality, kindness, compassion, gentleness, and cooperation in goodness, while having pure hearts and sincerity in all conditions. The following are among the requirements of this brotherliness: Not to wrong his Muslim brother or transgress against him. Not to leave his Muslim brother to be wronged, failing to support him in a situation where he can help him and remove the injustice practiced against him. Not to belittle him or look down upon him with contempt and disdain; this stems from arrogance in the heart. Then the Prophet (may Allah's peace and blessings be upon him) pointed out three times that piety lies in the heart, and whoever has piety in his heart, which entails good morals and fear and heedfulness of Allah, will not belittle a Muslim. Indeed, it is enough for him, as an evil trait and reprehensible manner, to belittle his fellow Muslim, for this results from arrogance in his heart. Then the Prophet (may Allah's peace and blessings be upon him) affirmed the aforementioned, saying that all of a Muslim is inviolable to another Muslim: his blood: to attack him by killing, injuring, beating him, or the like; his property: to take any of his properties unjustly; and his honor: to malign him or his lineage.