Arthashastra
मन्त्र पुरोहित सेना पति युव राजानाम् अन्यतम कोपो अभ्यन्तर कोपः ॥
The provocation of any one of the minister, the priest, the commander-in-chief, and the heir-apparent is what is termed internal trouble.
english translation
mantra purohita senA pati yuva rAjAnAm anyatama kopo abhyantara kopaH ॥
hk transliteration by Sanscript