Kautilya's Arthashastra 12.3.13

12.3.13

pratipanne dūṣyān asya śāsanaharān darśayet "etat tat" iti //

A spy employed as the personal servant of the king (the enemy) may inform him that such and such ministers of his are being interviewed by the enemy's servants. When he comes to believe this, some treacherous persons may be represented as the messengers of the enemy, specifying as "this is that."