Kautilya's Arthashastra 7.6.28

7.6.28

svadoṣeṇa gataḥ paradoṣeṇāgata ity akāraṇād gataḥ kāraṇād āgataḥ tarkayitavyaḥ " chidraṃ me pūrayiṣyati, ucito 'yam asya vāsaḥ, paratrāsya jano na ramate, mitrair me saṃhitaḥ, śatrubhir vigṛhītaḥ, lubdhakrūrād āvignaḥ śatrusaṃhitād vā parasmāt" iti //

Whoever runs away owing to his own fault and returns owing to his new master's wickedness is a renegade who had no reason to run away, but had reason to come back; such a person is to be examined.

When a king thinks that "This renegade supplies me with full information about my enemy's weakness, and, therefore, he deserves to remain here; his own people with me are in friendship with my friends and at enmity with my enemies and are easily excited at the sight of greedy and cruel persons or of a band of enemies," he may treat such a renegade as deserved.