But though the whole tribe was set apart for these important purposes, a strictly prescribed order regulated its particular functions to each branch, of which there were three, (a) The Levites, (b) The Priests, (c) The High-Priest.

(a) The Levites entered on their duties at the age of 30 (Num. iv. 23, 30, 35), and were consecrated, not as the priests, by anointing and investiture, but by a ceremony of washing accompanied by sacrifices, after which the elders laid their hands upon them, and Aaron presented them as a wave-offering before the Lord, in token that they were offered to the Lord by the congregation for the service of the sanctuary, and handed over by Him to the Priests[84]. Thus occupying a middle place between the people, who were all ideally a kingdom of priests, and the higher sacerdotal orders, they might approach nearer to the Tabernacle than the other tribes, but they might not offer sacrifice, nor burn incense, nor handle the holy vessels of the Sanctuary, till they were concealed from view (Num. iv. 15).

The Levites, then, were the assistants of the priests, and consisted of three families or sections, the sons of Gershon, Kohath, and Merari.

i. The Kohathites held the first rank, as being the family to which Aaron belonged. It was their duty, on the removal of the Tabernacle, to bear all the sacred vessels, including the Ark itself, but not before the priests had concealed them from the profane gaze with a dark blue pall (Num. iii. 31; iv. 6, 9, 15; Deut. xxxi. 25).

ii. The Gershonites were charged with the removal of the curtains, veils, and tent-hangings (Num. iv. 2226).

iii. To the Merarites was entrusted the heavier portion of the Tabernacle furniture, such as the boards, pillars, and bars, and therefore with the Gershonites they were permitted to use the oxen and waggons contributed by the congregation, while the Kohathites were only suffered to remove the sacred vessels on their shoulders (Num. vii. 19). With this arrangement agreed their position in the encampment in the wilderness. While the place of honour on the east was occupied by the sons of Aaron, the Kohathites were on the south, the Gershonites on the west, the Merarites on the north.

In place of territorial possessions, the Levites received the tithe of the produce of land and cattle, of which they again gave one-tenth to the priests (Num. xviii. 2426). At the close of the wanderings they would need a more fixed abode, and 48 cities with suburbs of pasture-land for their flocks and herds were assigned them. Of these the Levites had 35; Kohath 10; Gershon 13; Merari 12; while the remaining 13, including the six Cities of Refuge, were assigned to the Priests.

It was also designed that at the settlement of the nation in the Land of Promise their functions should be not only diffused as widely as possible, but should include others besides those of merely assisting the priests. They were to take the place of the old household priests, to share in all festivals and rejoicings (Deut. xii. 19; xiv. 26, 27; xxvi. 11), to preserve and transcribe the law (Deut. xvii. 912), and to read it publicly at the Feast of Tabernacles every seventh year (Deut. xxxi. 913).

(b) The Priests were consecrated to their office with far more imposing ceremonies than the Levites. After laying aside their old garments, they washed their bodies with pure water, were anointed with theholy oil, and then arrayed in their new vestments (Ex. xxix. 47). Themselves compassed about with infirmity, they needed to offer up sacrifice first for their own sins before they could intercede for others (Heb. v. 2; vii. 27). On the head therefore of a bullock they solemnly laid their hands, and thus symbolically transferred to it the guilt that clung to themselves; then in token of their entire devotion to their solemn calling, a ram was slain as a burnt-offering, and its blood sprinkled on the altar (Ex. xxix. 1018; Lev. viii. 18, 19). Another ram was next slain as a peace-offering, and some of its blood was smeared on the tip of the right ear, the thumb of the right hand, the great toe of the right foot, in token of their intention to devote every member to the service of Jehovah; and finally, as they were not only to intercede for the guilt of the people, but to offer their praises and thanksgiving, sacrificial cakes of unleavened bread with portions of the sacrifice were placed in their hands, and these they waved before the Lord (Ex. xxix. 1924).

The vestments they wore during their ministrations consisted of fine linen drawers, and over these a closely-fitting tunic or cassock, white, woven whole in one piece and broidered, reaching to the feet. This was confined round the waist by a girdle wrought with needle-work, exhibiting the three sacred colours, blue, purple, and scarlet, intermingled with white. Upon their heads they wore a linen tiara in the form of the calyx of a flower. In all their ministrations they seem to have been bare-footed.