backbiting and slander

هَمَّازٍ مَّشَّآءٍۭ بِنَمِيمٍ

[And] scorner, going about with malicious gossip -

وَيْلٌ لِّكُلِّ هُمَزَةٍ لُّمَزَةٍ

Woe to every scorner and mocker

ٱلَّتِى تَطَّلِعُ عَلَى ٱلْأَفْـِٔدَةِ

Which mounts directed at the hearts.