N.J. Stat. § 18A:6-31.1
Whenever any district is divided into two or more districts those persons having tenure, in office, position or employment in such district, shall continue to have tenure in the district which comprises the territory in which they were serving at the time of the division; the persons having tenure in office, position or employment in such district whose services were not exclusively confined to the territory comprising any one of the districts as so divided, at the time of the division, shall be employed, if their services are so required, in the district having the highest number of pupils in average daily attendance during the second academic year preceding the academic year in which the new district is created as certified by the department and those persons having tenure in office, position or employment in the original district who are not employed by the board of education of either district shall retain the seniority and tenure rights acquired in the original district and shall be employed in accordance therewith as vacancies occur in either the original district or the new district before any other persons are so employed in similar offices, positions or employments.
N.J.S. § 18A:6-31.1