Kautilya's Arthashastra 3.14.4

3.14.4

"nānyas tvayā kārayitavyo, mayā vā nānyasya kartavyam" ity avarodhe bhartur akārayato bhṛtakasyākurvato vā dvādaśapaṇo daṇḍaḥ //

An employer may be at liberty to get the work done by (another) provided there is no such adverse condition that the former shall not employ another servant to execute the work, nor shall the latter go elsewhere for work.

An employer not taking work from his labourer or an employee not doing his employers work shall be fined 12 panas. An employee who has received wages to do a certain work which is however, not brought to termination shall not, of his own accord, go elsewhere for work.