Lay thier hands on them

Numbers 8:1-26
Every firstborn male in Israel, wherther man or animal, is mine. One tenth of all congregation in church should serve the Lord as Levites.
Isarelite are to lay thier hands on them. Aaron is to present the Levites before the Lord as a wave offering from the Israelite.  Levites lay their hands on the heads of the bulls, use the one for a sin offering to the Lord and the other for a burnt offering, to make attonement for the Levites. Have the Lebites stand in fromt of Aaron and his sons and then present them as a wave offering to the Lord.
When Levites is at the age of fifty or more, they must retire from thier regular service and work no linger. They may assist their brothers in performing their duties at the Tent of Meeting, but they themsleves must not do the work.
Why?
Those who serve God must be clean through and through. Washing and shaveing ensure outward cleanliness. THe blood of sacrifice cleans the inward stain of sin.
Servant of the Lord must repent and confesses his sin and repent before the Lord, purify his inner heart and outer clothes and wash their body.
If the daily prayer of a church has at least one tenth will be the basic requirement.
How?
Minister and pastor and elder are the Levites of the Lord in this generation, New Testament. Be ware of what my obligation is and do it with all my heart, my strength and my mind.