http://revach.net/article.php?id=4047

Section: Daily Reminder   Category: Zechiras Miriam
The Chofetz Chaim's Lists & Conditions

All throughout Sefer Shmiras HaLashon Hilchos Lashon Hara the Chofetz Chaim gives different lists.  If you look at those lists, they are almost all of the same nature.  Sometimes it is permissible to speak Lashon Hara and even obligatory.  Even then it is not so simple and you must fulfill various requirements before undertaking this dangerous task.  If you are going to speak Lashon Hara make sure you are familiar with all these requirements and have these lists handy at all times so that you don't make any fatal mistakes.  Good luck!

"Zachor Eis Asher Asa Hashem L'Miriam BaDerech B'Tzaischem MiMitzrayim"

The Ramban and other Rishonim count, among the Mitzvos Aseh Min HaTorah, the mitzva of remembering and saying with your mouth each day what Hashem did to Miriam when she spoke about her brother Moshe.  The Chofetz Chaim in Shaar Tvunah Perek 12 says that being Mikayem this mitzva can save you from the aveira of Lashon Hara.  More than just saying the pasuk, says the Chofetz Chaim, one must think about the incident in order for it to have its intended effect.
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