Jesus was, in fact, the teacher of his disciples, but he forbade them, at Matthew 23:8, to covet that designation or to apply it to themselves as a title, as was done by the scribes. (Mt 23:2, 6, 7)
... Jesus showed how difficult their attitude and practices had made it for them to come into God’s favor, saying to them: “Serpents, offspring of vipers, how are you to flee from the judgment of Gehenna?” (Mt 23:1-33)