[7]. Surah Al-Araaf [The Heights]
Ayat 199. Show forgiveness, enjoin what is good, and turn away from the foolish (i.e. don't punish them).
Ayat 200. And if an evil whisper comes to you from Shaitan (Satan) then seek refuge with ALLAH . Verily, He is All-Hearer, All-Knower.
English Translation of Hadith
Hazrat Anas said: The Messenger of ALLAH said, "During the Mi`raj (the Night of Ascension), I saw a group of people who were scratching their chests and faces with their copper nails. I asked, `Who are these people, O Jibril?' Jibril replied: `These are the people who ate flesh of others (by backbiting) and trampled people's honour.''
[Abu Dawud Hadith # 4878].
Lesson:
As mentioned above in Surah Al-Araaf Ayat 199. "enjoin what is good, and turn away from the foolish" "These are the people who ate flesh of others'' is a metaphor for backbiting. "To trample people's honour'' is akin to harming their goodwill and honour. The punishment for these things mentioned in Hadith makes their seriousness obvious.