Miszna do Kapłańska 18:21

Rabbi Elazar of Modiin said: one who profanes sacred things, and one who despises the festivals, and one who causes his fellow’s face to blush in public, and one who annuls the covenant of our father Abraham, may he rest in peace, and he who is contemptuous towards the Torah, even though he has to his credit [knowledge of the] Torah and good deeds, he has not a share in the world to come.