Valmiki Ramayana Kishkindha Kanda Sarga 18 Shloka 63

यः whoever, दण्ड्ये deserves to be punished, दण्डम् punishment, पातयेत् inflicts, यश्चापि and whosoever, दण्ड्यः sinner, दण्ड्यते punished, कार्यकारणसिद्धार्थौ with regard to cause and effect, तौ they, उभौ both, नावसीदतः do not become despondent.

'The sinner and the punisher, whoever gives punishment and whoever receives it, are both regulated by the law of cause and effect. So do not despair.