The duties have been laid down in the scriptures of only the four principal castes. About others, the scriptures are entirely silent. Among all the castes, the members of those castes that have no duties assigned to them by the scriptures, need entertain no fears as to what they do.
चतुर्णामेव वर्णानां धर्मो नान्यस्य विद्यते। वर्णानां धर्महीनेषु संख्या नास्तीह कस्यचित्॥