Surah Al-Qalam 68:11

هَمَّازٍ مَّشَّآءٍۭ بِنَمِيمٍ

[And] scorner, going about with malicious gossip -

Translation: Saheeh International

Tafsir

backbiting faultfinder that is to say calumniator scandal-monger spreading evil talk among people in order to sow dissension between them

Excerpt from Tafsir al-Jalalayn, commentary on 68:11, via Quran.com. The reader has the full commentary and 9 more tafsirs.