Kautilya's Arthashastra 7.5.48

7.5.48

viśiṣṭād alpam apy aṃśaṃ labdhvā tuṣṭamukho vrajet /
anaṃśo vā tato 'syāṅke prahṛtya dviguṇaṃ haret //

An ally of superior power should not be relied upon, for prosperity changes the mind. Even with little or no share in the spoils, an ally of superior power may go back, appearing contented; but some time afterwards, he may not fail to sit on the lap of the conqueror and carry off twice the amount of share due to him.