On the Life of Moses: Books 1-3 (1.316-1.320)

And as the smaller body had received each a larger share of the booty, by reason of their having been the foremost in encountering danger, and the larger body had received each a smaller share, by reason of their having remained at home; it appeared indispensable that they should consecrate the first fruits of the whole of the booty; those therefore who had remained at home brought a fiftieth, and those who had been actually engaged in the war, brought and contributed a five hundredth part; and of ten first fruits Moses commanded that portion which came from those who had borne a part in the expedition, to be given to the high priest, and that portion which came from those who had remained in the camp, to the keepers of the temple whose name were the Levites.

And the captains of thousands, and centurions, and all the rest of the multitude of commanders of battalions and companies willingly contributed special first fruits, as an offering for their own safety, and that of those who had gone out to war, and for the victory which had been gained in a manner beyond all hope, giving up all the golden ornaments which had fallen to the lot of each individual, in the apportionment of the booty, and the most costly vessels, of which the material was gold.

those which had been given by the men who had borne their share in the war, he distributed among the keepers of the temple as among men who had only displayed one half of virtue, namely eagerness without action; but the first fruits of those who had warred and fought, who had encountered danger with their bodies and lives, and thus had displayed perfect and complete excellence, he allotted to him who presided over the keepers of the temple, namely to the high priest; and the first fruits of the captains, as being the offerings of chiefs and rulers, he allotted to the great ruler of all, namely to God.

All these wars were carried on and brought to an end before the Hebrews had crossed Jordan, the river of the country, being wars against the inhabitants of the country on the other side of Jordan, which was a rich and fertile land, in which there was a large champaign fertile in corn, and also very productive of herbage and fodder for cattle;

and when the two tribes who were occupied in feeding cattle saw this country, the two tribes being a sixth part of the whole Hebrew host, they besought Moses to permit them to take their inheritance in that district, where in fact they were already settled; for they said that the place was very suitable for cattle to be kept, and fed, and bred in, inasmuch as it was well watered and full of good herbage, and as it produced spontaneously abundant grass for the feeding of sheep.