Matthew 23:10

10Neitherμηδὲbe calledκληθῆτεinstructorsκαθηγηταί,sinceὅτι[the] instructorκαθηγητὴςof youὑμῶνisἐστινOneεἷςtheὁChristχριστός·

Neither shall you⁺ be called instructors, because One is your⁺ Instructor, the Christ.