Manusmriti

siva.sh/manusmriti/8/381

न ब्राह्मणवधाद् भूयानधर्मो विद्यते भुवि । तस्मादस्य वधं राजा मनसाऽपि न चिन्तयेत् ॥ ३८१ ॥

sanskrit

No greater crime is known on earth than slaying a Brahmana; a king, therefore, must not even conceive in his mind the thought of killing a Brahmana.

english translation

na brAhmaNavadhAd bhUyAnadharmo vidyate bhuvi | tasmAdasya vadhaM rAjA manasA'pi na cintayet || 381 ||

hk transliteration by Sanscript