Arthashastra
"नित्यम् आसन्नम् अरि बलं वासयेद् अन्यत्र अभ्यन्तर कोप शङ्कायाः" इति ॥
for example: "A king may allow his enemy's army to be present close to his territory, unless he suspects of the existence of any internal trouble."
english translation
"nityam Asannam ari balaM vAsayed anyatra abhyantara kopa zaGkAyAH" iti ॥
hk transliteration by Sanscript