V.6-22 The Levites are to be prepared for the service of the Lord. Only water, not blood is used. (See John 13:6-106Then cometh he to Simon Peter: and Peter saith unto him, Lord, dost thou wash my feet? 7Jesus answered and said unto him, What I do thou knowest not now; but thou shalt know hereafter. 8Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me. 9Simon Peter saith unto him, Lord, not my feet only, but also my hands and my head. 10Jesus saith to him, He that is washed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all. (John 13:6‑10)). The water is like the Word of God. Believers need the Word to keep clean (Eph. 5:2525Husbands, love your wives, even as Christ also loved the church, and gave himself for it; (Ephesians 5:25)). Remember the priests were for the worship of God, but the Levites (this chapter) were for service. Verse 19 shows that the Levites were secondary to the priests. We believers are both, but worship must take first place. Read these verses slowly.
V.23-26 The mature and productive years of their life were to be devoted to the Lord’s service. After 50 years of age, they could go into the tabernacle, but not to do any work of service.