Kautilya's Arthashastra 7.8.11

7.8.11

arivijigīṣvos tu svaṃ svaṃ mitram anugṛhṇatoḥ śakyakalyabhavyārambhisthirakarmānuraktaprakṛtibhyo viśeṣaḥ //

The conqueror and his enemy helping their respective friends differ according as their friends are such or are not such as undertake possible, praiseworthy or productive works and as are resolute in their undertakings and are provided with loyal and devoted subjects.