After long seclusion on the mount alone with God, Moses ordered the erection of a house of worship. It had to be portable, so as to accompany them in their wanderings and express visibly, wherever set up, the religious unity of the twelve tribes. Aaron and his sons were consecrated to be the official priesthood of this new shrine and were clothed and instructed accordingly. Minute details regulated all sacrifices, and similar minute instructions enabled the priests to decide questions of ceremonial cleanness and uncleanness in matters of food and health. All these laws and regulations, mainly recorded in Leviticus, were given through Moses, either alone or in association with his brother. It is not surprising to learn that there were those who challenged this exclusive leadership in every department of the national life. We read of a willful disregard of divine orders even in the family of Aaron, with immediate fatal results. Lev. 10:1-7. Like punishment overtook those members of the tribe of Levi who showed jealousy of the house of Aaron, and those elements in other tribes that claimed rights equal or superior to those of Moses. Num., chs. 16, 17. It would be strange, indeed, if God, who had vindicated his servant Moses against Pharaoh, should let his own authority as represented by Moses be challenged within the camp of Israel. He punished to save. Just as God took up the Sabbath and circumcision, old customs of the preceding era, into the law of Israel, so also he spoke to this people through an elaborate system of feasts and pilgrimages, which bound up their whole year with the worship of God. Indeed, the principle of the seventh part of time as sacred was extended to the seventh year, and even to the fiftieth year (the year following the seventh seven), for beneficent social and economic uses. Lev., ch. 25. When at length the nation, thus organized and equipped, set forth from Sinai, Num. 10:11, they required a leadership of a different kind--military leadership and practical statesmanship. They found both in Moses. He it was who led them through all the long wanderings in the peninsula of Sinai, bearing their murmurings and meeting their recurrent difficulties with a patience that seems almost divine, save for that one lapse which was to cost him and Aaron their entrance into the Promised Land. Num. 20:10-12. At the border of the land, from the top of Pisgah in the long mountain wall of Moab, Moses at last looked down into that deep gorge of the Jordan Valley at his feet, which separated him from the hills of Canaan. Beyond this river and the Dead Sea, into which it empties, lay the land long ago promised to the seed of Abraham. Moses had been permitted to lead the people to its very gateway; but it remained for another, his younger helper, Joshua, to lead them through the gate into the house of rest. The Book of Deuteronomy