Be Nice
O you who believe, avoid much suspicion, for some suspicion is sinful. Do not spy on one another, nor backbite. Would any of you like to eat the flesh of his dead brother? You would detest it.
49:12O ye who believe! Shun much suspicion; for lo! some suspicion is a crime. And spy not, neither backbite one another. Would one of you love to eat the flesh of his dead brother? Ye abhor that (so abhor the other)! And keep your duty (to Allah). Lo! Allah is Relenting, Merciful.