Kautilya's Arthashastra 1.18.8

1.18.8

ekacaraḥ suvarṇapākamaṇirāgahemarūpyapaṇyākara.karmāntān ājīvet //

Or moving alone, he may earn his livelihood by working in gold mines or ruby mines or by manufacturing gold and silver ornaments or any other commercial commodities. Having acquired close intimacy with heretics (páshanda), rich widows, or merchants carrying on ocean traffic he may, by making use of poison (madanarasa), rob them of their wealth as well as the wealth of gods unless the latter is enjoyable by Bráhmans learned in the Vedas. Or he may adopt such measures as are employed to capture the villages of a foreign king. Or he may proceed (against his father) with the help of the servants of his mother.