Following verses were revealed against an enemy of Prophet Muhammad (saww) who called the Prophet 'Mad':

هَمَّازٍ مَّشَّاءٍ بِنَمِيمٍ

A slanderer, going about with calumnies. [68:11]

مَّنَّاعٍ لِّلْخَيْرِ مُعْتَدٍ أَثِيمٍ

Hindering good, transgressing, deep in sin. [68:12]

عُتُلٍّ بَعْدَ ذَٰلِكَ زَنِيمٍ

Violent (and cruel),- with all that, illegitimate. [68:13]