Not Saying Hashem’s Name in Vain
The Gemara in Nedarim (7b) says, “Rav Chanin said in the name of Rav: Whoever hears the utterance of the Divine name [in vain] from his friend has to excommunicate him.
Chinuch
Whether parents and teachers may say Hashem's name while teaching blessings to children or new learners, and techniques for minimizing it.
The Gemara in Nedarim (7b) says, “Rav Chanin said in the name of Rav: Whoever hears the utterance of the Divine name [in vain] from his friend has to excommunicate him.