Joshua 1:12

12.And to the Reubenites, etc An inheritance had been granted them beyond the Jordan, on the condition that they should continue to perform military service with their brethren in expelling the nations of Canaan. Joshua therefore now exhorts them to fulfil their promise, to leave their wives, their children, and all their effects behind, to cross the Jordan, and not desist from carrying on the war till they had placed their brethren in peaceable possession. In urging them so to act, he employs two arguments, the one drawn from authority and the other from equity. He therefore reminds them of the command given them by Moses, from whose decision it was not lawful to deviate, since it was well known to all that he uttered nothing of himself, but only what God had dictated by his mouth. At the same time, without actually asserting, Joshua indirectly insinuates, that they are bound, by compact, inasmuch as they had engaged to act in this manner. (27) He next moves them by motives of equity, that there might be no inequality in the condition of those to whom the same inheritance had been destined in common. It would be very incongruous, he says, that your brethren should be incurring danger, or, at least, toiling in carrying on war, and that you should be enjoying all the comforts of a peaceful settlement.

When he orders them to precede or pass before, the meaning is, not that they were to be the first to enter into conflict with the enemy, and in all emergencies which might befall them, were to bear more than their own share of the burden; he only in this way urges them to move with alacrity, as it would have been a kind of tergiversation to keep in the rear and follow slowly in the track of others. The expression, pass before your brethren, therefore, does not mean to stand in the front of the battle, but simply to observe their ranks, and thereby give proof of ready zeal. For it is certain that as they were arranged in four divisions they advanced in the same order. As he calls them men of war, we may infer, as will elsewhere more clearly appear, that the aged, and others not robust, were permitted to remain at home in charge of the common welfare, or altogether relieved from public duty, if in any way disabled from performing it.