John Wesley on Numbers 6:2

Man or woman - For both sexes might make this vow, if they were free and at their own disposal: otherwise their parents or husbands could disannul the vow. A vow of a Nazarite - Whereby they sequestered themselves from worldly employments and enjoyments, that they might entirely consecrate themselves to God's service, and this either for their whole lifetime, or for a less and limited space of time.