Rabbi Sacks carries over the theme of speech in his drash on Metzora.  Intriguingly, the Talmud doesn’t address the corollary, lashon tov.  Shouldn’t it be a mitzvah to speak well of someone if it’s a sin to do the opposite?  Please follow the link below to read his analysis of different Talmudic passages on the topic of speech, both good and bad, where the most common perspective is that both are not advisable:

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