Rabbi Yisroel Mayer Kagan, the Chofetz Chaim, codified the laws in Judaism regarding proper speech. Source -
Chofetz Chaim Biography
Primarily, it is forbidden to speak derogatorily, which means it is forbidden to say something that will diminish another in the eyes of the one listening. The consequences of doing so trigger a spiritual court system to bring all three to justice, the one spoken about, the one listening, and the one talking. Watch Rabbi Mendel Kessin speak about this: Power of Speech
The laws of proper speech are conveniently arranged for five minute a day study in Chofetz Chaim: A Lesson a Day: The Concepts and Laws of Proper Speech Arranged for Daily Study (Artscroll Series)
There is also Chofetz Chaim, a daily companion: The concepts and laws of proper speech as formulated by Sefer Chofetz Chaim, arranged for daily study by the Manchester ... Rabbi Yehudah Zev Segal (ArtScroll series)
as well as GUARD YOUR TONGUE
Go to Artscroll
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