The Scofield Bible Commentary, by Cyrus Ingerson Scofield, , at sacred-texts.com
There is a beautiful moral order in chapters 6-7.
separation, (Num 6:1-12);
worship, (Num 6:13-21);
blessing, (Num 6:22-27)
service, (Num 7:1-89).
See (Heb 13:12-16).
The Nazarite (more accurately Nazirite, one separated) was a person of either sex separated wholly unto the Lord. Abstention from wine, the symbol of mere natural joy (Psa 104:15) was the expression of a devotedness which found all its joy in the Lord (cf); (Psa 87:7); (Psa 97:12); (Hab 3:18); (Plm 3:1); (Plm 3:3); (Plm 4:4); (Plm 4:10). The long hair, naturally a reproach to man (Co1 11:14) was at once the visible sign of the Nazarite's separation, and of his willingness to bear reproach for Jehovah's sake. The type found its perfect fulfilment in Jesus, who was "holy, harmless, undefiled and separate from sinners" (Heb 7:26) who was utterly separated unto the Father; (Joh 1:18); (Joh 6:38) who allowed no mere natural claim to hinder or divert Him. (Mat 12:46-50).
(See Scofield) - (Exo 29:33).