N.J. Stat. § 18A:28-6.1
Whenever, heretofore or hereafter, any board of education in any school district in this state shall discontinue any high school, junior high school, elementary school or any one or more of the grades from kindergarten through grade 12 in the district and shall, by agreement with another board of education, send the pupils in such schools or grades to such other district, all teaching staff members who are assigned for a majority of their time in such school, grade or grades and who have tenure of office at the time such schools or grades are discontinued shall be employed by the board of education of such other district in the same or nearest equivalent position; provided that any such teaching staff member may elect to remain in the employ of the former district in any position to which he may be entitled by virtue of his tenure and seniority rights by giving notice of said election to the boards of education in each of the school districts at least three months prior to the date on which such school, grade, or grades are to be discontinued. Teaching staff members so employed in such other district shall have their rights to tenure, seniority, pension and accumulated leave of absence, accorded under the laws of this state, recognized and preserved by the board of education of that district. Any periods of prior employment in such sending district shall count toward the acquisition of tenure in the other district to the same extent as if all such prior employment had been in such other district.
N.J.S. § 18A:28-6.1