Thus were the Levites given as "a gift for the Lord," to have charge of the tabernacle and the sanctuary--though not to officiate there as did the priests--and to "do the service of the congregation." So that Aaron, who was now high priest, or bishop over the lesser priesthood, had under him, not only his sons, in the priests' quorum, but also a great body of Levites (were they not as teachers and deacons?) to officiate in the minor quorums. Hence the origin of the term Levitical, as applied to this priesthood. Slain for Offering Strange Fire.--Soon after this organization and selection, Nadab and Abihu were slain by the Lord for "offering strange fire" before him, or officiating when he "commanded them not," and Eleazer, Aaron's third son, then took the senior's place. He was made "chief over the chief of the Levites," having oversight of those who had charge of the sanctuary. Thus, while Eleazer presided over the Levites, Aaron presided over both priests and Levites; Moses, by virtue of his superior calling, retaining the controlling power or presidency over the whole. The Law and the Testimony.--Eleven months and twenty days the Israelites had sojourned in Sinai. During this period they had celebrated their second Passover, or feast of unleavened bread. Two other annual feasts they were commanded to keep, namely the feast of Pentecost, or the promulgation of the law, and the feast of Tabernacles, or tents, commemorating their sojourn in the wilderness. The laws of Moses were now promulged and codified; the tables of the testimony, having been renewed, were placed, with other sacred relics, in the ark for safe keeping; and the sublime system of heaven-revealed religion was set in motion. On to Canaan!--The civil and military wings of this nomadic power, springing as if by magic from an unorganized rabble, without laws, institutions, or prescribed method of worship, into a compact and powerful nation, were now in full equipment and discipline. "On to Canaan!" was the national cry. And so, on the twentieth day of their second year, or about May 20, 1490 B. C., the Camp of Israel struck their tents, and guided by the cloud and pillar of God, which had been with them since the memorable night when the fetters of two centuries were stricken off and the power of Egypt submerged, they began their march through the Sinaitic desert toward the wilderness of Paran.