The Routledge Dictionary of Judaism
In classical Judaism, uttering the tetragrammaton—the four letter name of God—after prior warning not to do so. That narrow definition occurs at Mishnah Sanhedrin 7:5.
A broader definition, encompassing those who have no portion in the world to come, occurs at Mishnah Sanhedrin 10:1 and covers, further, “(1) He who says, the resurrection of the dead is a teaching which does not derive from the Torah, (2) and the Torah does not come from Heaven, and (3) an Epicurean (see APIKOROS). R. Aqiba says, ‘Also: (4) He who reads in heretical books, and (5) he who whispers over a wound and says, ‘I will put none of the diseases upon you which I have put on the Egyptians, for I am the Lord who heals you’ (Exodus 15:26). Abba Saul says, ‘Also: (6) He who pronounces the divine name as it is spelled out.’ ”
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