惡人自有惡人磨 [恶－－－恶－－]

Jyutping ok3 jan4 zi6 jau5 ok3 jan4 mo4
Pinyin è rén zì yǒu è rén mó

Definitions (CC-CANTO)
  1. A wicked person will be harassed or bedeviled by another of like; That comes around; Bad guys will not end well.
Definitions (粵典–words.hk)
  1. 語句
    一​啲​兇惡​、​蝦​蝦​霸​霸​嘅​人​，​遲​早會​遇到​同​佢​同​類​嘅​人​，​其他人​冇​需要​理​佢​哋​嘅​事
    a ruthless person will eventually suffer at the hands of someone even more ruthless