After Canaan had been conquered, the state of things in connection with the priesthood would be something like this. The tent with the ark would be the principal sanctuary, served by a hereditary Levitic priesthood, at the head of which would be a descendant of Aaron. The tribe of Levi, being nomadic, would probably encamp in the neighbourhood of the central sanctuary in part, and recruits for the priestly work would be taken occasionally from them, while other sections would gravitate to the neighbourhood of other sanctuaries. As we see from the story of Micah in Judges, it was considered desirable to have a Levite for priest everywhere, and consequently there would arise at all the High Places Levitic priesthoods, most probably in part hereditary. But notwithstanding their dues, the bulk of the tribe, being nomads, would be looked upon by the agricultural population as poor, just as the Bedouin, in Palestine now are, comparatively speaking, very poor. This state of things would correspond entirely with what Deuteronomy tells us; and after that legislation the position of the Levites as a priestly body would be more assured than ever. In the post-exilic period all that had been regulated by practice in earlier days found written expression. Differentiation of function was minutely carried out. The priesthood was confined rigorously to the Aaronic house, and the other Levites were given to them as attendants. In this way the whole Levitic system was introduced, and with the exclusive altar came the exclusive priesthood. So far as I can see, it is only by some such hypothesis that justice can be done to _all_ the statements of Scripture; and considering the elastic nature of Old Testament law, there is nothing improbable in it. In any case there is an amount of evidence of various kinds for the Mosaic origin of the Levitic, and even the Aaronic priesthood, which no proof of irregularities can overturn.