Matthew 23:8

But be not ye called Rabbi

(υμεις δε μη κληθητε Ραββε). An apparent aside to the disciples. Note the emphatic position of υμεις. Some even regard verses Matthew 23:8-10 as a later addition and not part of this address to the Pharisees, but the apostles were present. Euthymius Zigabenus says: "Do not seek to be called (ingressive aorist subjunctive), if others call you this it will not be your fault." This is not far from the Master's meaning. Rabbi means "my great one," "my Master," apparently a comparatively new title in Christ's time.