Cheating and deception are despicable characteristics that are beneath a decent person. Intentionally distorting the truth in order to mislead others contradicts the values of honesty, which requires an attitude of sincerity, straightforwardness, and fairness that leaves no room for cheating, lying, trickery, or deceit. There are many texts from the Quran and the Sunnah conveying the meaning that cheating, whether the target be Muslims or non-Muslims, is forbidden.
Accepting the guidance of Islam leads a person to truthfulness, which means a person completely avoids cheating, cheating, and back-stabbing. The Prophet of Islam said:
“Whoever bears arms against us is not one of us, and whoever cheats us is not one of us.” (Saheeh Muslim)
According to another report, the Prophet passed by a pile of food in the market. He put his hand inside it and felt dampness, although the surface was dry. He said:
“O owner of the food, what is this?’
The man said, ‘It was damaged by rain, O Messenger of God.’
He said, ‘Why did you not put the rain-damaged food on top so that people could see it! Whoever cheats us is not one of us.” (Saheeh Muslim)
Muslim society is based on purity of feeling, love, sincerity towards every Muslim, and fulfillment of promises to every member of society. Its members are endowed with piety, truthfulness, and faithfulness. Cheating and deception are alien characters in contrast to the noble character of a true Muslim. There is no room in it for swindlers, double crossers, tricksters, or traitors.
Islam views cheating and deception as heinous sins, a source of shame to the one guilty of committing them, both in this world and the next. The Prophet, may the mercy and blessings of God be upon him, did not merely denounce them by excluding them from the Muslim community in this world, he also announced that on the Day of Judgment every traitor would be raised carrying the flag of his betrayal. A caller will cry out from the vast arena of judgment, pointing to him, drawing attention to him:

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