On the Life of Moses: Books 1-3 (1.311-1.315)

Therefore they destroyed all their cities, razing them to the ground or else burning them, so that no one could tell that any cities had ever been inhabited in that land. And they led away a perfectly incalculable number of prisoners, of whom they chose to slay all the full-grown men and women, the men because they had set the example of wicked counsels and actions, and the women because they had beguiled the youth of the Hebrews, becoming the causes to them of incontinence and impiety, and at the last of death; but they pardoned all the young male children and all the virgins, their tender age procuring them forgiveness;

and as they had taken a vast booty from the king’s palace, and from private houses, and also from the dwellings of all kinds in the open country (for there was not less booty in the country places than in the cities), they came to the camp, laden with all the wealth which they had taken from the enemy.

And Moses praised Phinehas their general, and those who had served under him for their good success, and also because they had not been covetous of their own advantage, running after booty and thinking of nothing, but appropriating the spoil to themselves, but because they had brought it all into the common stock, so that they who had staid behind in the tents might share in the booty; and he ordered those men to remain outside the camp for some days, and the high priest he commanded to purify both the men themselves, and those of their allies who had returned from fighting by their side, of

for even though the slaughter of the enemies of one’s country is according to law, still he who kills a man, even though justly and in self-defence, and because he has been attacked, still appears to be guilty of blood by reason of his supreme and common relationship to a common father; on which account those who had slain enemies were in need of rites of purification, to cleanse them from what was looked upon as a pollution.

However, after no long lapse of time he divided the booty among those who had taken a part in the expedition, and they were but a small number, giving one half among those who had remained inactive at home, and the other half to those who were still in the camp; for he looked upon it as just and equitable to give the share of the advantages gained, to those who had shared in the contest, if not with their souls, at all events with their bodies; for as the spectators were not inferior to the actual combatants in their zeal, they were inferior only in point of time and in respect of their being anticipated.