Matsya Purana 220.16

220.16

kṛtvā ca vijayanteṣāṃ śatrūn bāhyāṃstato jayet.
bāhyāśca vividhā jñeyāstulyābhyantarakṛtrimāḥ .. 220.16 ..

Then he should conquer the external foes. These outside enemies are of various classes according as they are equal to him or under his control or quite accidental and so artificial arising out of needs, and they should be treated with greater or less caution as they belong to the former or latter class—16