Kautilya's Arthashastra 2.9.32

2.9.32

yathā hy anāsvādayituṃ na śakyaṃ jihvātalasthaṃ madhu7 vā viṣaṃ vā / [ś]
arthas tathā hy arthacareṇa rājñaḥ svalpo 'py anāsvādayituṃ na śakyaḥ //[ś]

Just as it is impossible not to taste the honey or the poison that finds itself at the tip of the tongue, so it is impossible for a government servant not to eat up, at least, a bit of the king's revenue. Just as fish moving under water cannot possibly be found out either as drinking or not drinking water, so government servants employed in the government work cannot be found out (while) taking money (for themselves).