Suspicion is mentioned in the Quran in these verses:

[49:12] O you who believe, you shall avoid any suspicion, for even a little bit of suspicion is sinful. You shall not spy on one another, nor shall you backbite one another; this is as abominable as eating the flesh of your dead brother. You certainly abhor this. You shall observe God. God is Redeemer, Most Merciful.

To learn more, read the Quran in English.

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