Valmiki Ramayana 3.17.23
विभीषणः तु धर्मात्मा न तु राक्षस चेष्टितः ।प्रख्यात वीर्यौ च रणे भ्रातरौ खर दूषणौ॥
vibhīṣaṇaḥ tu dharmātmā na tu rākṣasa ceṣṭitaḥ |prakhyāta vīryau ca raṇe bhrātarau khara dūṣaṇau ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book