Arthashastra
प्रतिपन्ने दूष्यान् अस्य शासन हरान् दर्शयेत् "एतत् तत्" इति ॥
When he comes to believe this, some treacherous persons may be represented as the messengers of the enemy, specifying as "this is that."
english translation
pratipanne dUSyAn asya zAsana harAn darzayet "etat tat" iti ॥
hk transliteration by Sanscript