This is the law of the Nazarite who hath vowed, and of his offering unto the LORD for his separation, beside that that his hand shall get: according to the vow which he vowed, so he must do after the law of his separation.
This is the rule for the Nazarite who made a promise, and their special gift to God for being set apart, in addition to what they earn: they must follow the promise they made according to the rules of their separation.