All this was to be done with sacrifice. Yes! in everything, and by every service, JESUS, the great sacrifice both for sin, and for our acceptance is held forth. That sweet scripture of the apostle to the Hebrews, is a gracious instruction to us upon many occasions. Hebrews 10:14.
Related Commentaries of Numbers 8:20
Numbers 8:20-21
20 And Moses, and Aaron, and all the congregation of the children of Israel, did to the Levites according unto all that the LORD commanded Moses concerning the Levites, so did the children of Israel unto them.
21 And the Levites were purified, and they washed their clothes; and Aaron offered them as an offering before the LORD; and Aaron made an atonement for them to cleanse them.