Didn't he (Muawiya) kill one of the companions of the prophet, Hujr ibn Adi (ra), for refusing to curse the Imam (as)?
Sow la idiinma sheegin inaanu nabi Maxammad waligii amrin in qof ashahaadanaya la dilo, madixii munaafiqiinta ee Cabdullaahi Ibnu Saluulna ha ahaadee?.