21 The Levites purified themselves from sin, and they washed their clothes; and Aaron offered them for a wave offering before Yahweh; and Aaron made atonement for them to cleanse them.
and Aaron shall offer the Levites before Yahweh for a wave offering, on the behalf of the children of Israel, that it may be theirs to do the service of Yahweh. The Levites shall lay their hands on the heads of the bulls, and you shall offer the one for a sin offering, and the other for a burnt offering to Yahweh, to make atonement for the Levites. You shall set the Levites before Aaron, and before his sons, and offer them as a wave offering to Yahweh.
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Commentary on Numbers 8 Matthew Henry Commentary
Chapter 8
This chapter is concerning the lamps or lights of the sanctuary.
Num 8:1-4
Directions were given long before this for the making of the golden candlestick (Ex. 25:31), and it was made according to the pattern shown to Moses in the mount, Ex. 37:17. But now it was that the lamps were first ordered to be lighted, when other things began to be used. Observe,
Num 8:5-26
We read before of the separating of the Levites from among the children of Israel when they were numbered, and the numbering of them by themselves (ch. 3:6, 15), that they might be employed in the service of the tabernacle. Now here we have directions given for their solemn ordination (v. 6), and the performance of it, v. 20. All Israel must know that they took not this honour to themselves, but were called of God to it; nor was it enough that they were distinguished from their neighbours, but they must be solemnly devoted to God. Note, All that are employed for God must be dedicated to him, according as the degree of employment is. Christian musts be baptized, ministers must be ordained; we must first give ourselves unto the Lord, and then our services. Observe in what method this was done: