What does Islam say about avoiding negative suspicion (su'ud dhann) of others?

Islam recognizes that unfounded suspicion about others' intentions is a serious threat to trust within a community, and it addresses this directly rather than treating it as a harmless private thought. The Quran instructs, "O you who believe, avoid much [negative] assumption. Indeed, some assumption is sin" (49:12), placing baseless suspicion in the same verse as the prohibitions on spying and backbiting, since the three often feed one another — a suspicious thought leads to spying to confirm it, which leads to speaking about what was found. The Prophet reinforced this sharply: "Beware of suspicion, for suspicion is the falsest of speech" (Sahih al-Bukhari 6066, Sahih Muslim 2563), meaning that assuming the worst about someone without evidence is itself a form of dishonesty, since it treats an unverified guess as though it were established fact. This does not mean naivety is required — reasonable caution given clear evidence of wrongdoing differs from habitual, baseless suspicion of people's motives. The healthier default Islam encourages is husn al-dhann, good assumption: interpreting others' words and actions charitably where genuine doubt exists, and seeking clarification directly rather than assuming the worst in silence.

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