Arthashastra
दूष्य शुद्धायां पौरेषु जानपदेषु वा दण्ड वर्जान् उपायान् प्रयुञ्जीत ॥
In order to separate citizens and country-people from traitors, the king should employ all the strategic means, except coercion.
english translation
dUSya zuddhAyAM paureSu jAnapadeSu vA daNDa varjAn upAyAn prayuJjIta ॥
hk transliteration by Sanscript