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by smoyer 4657 days ago
This one took me a while ;)

1) Koran - [4:148] GOD does not like the utterance of bad language, unless one is treated with gross injustice. GOD is Hearer, Knower.

2) Talmud - [Ketubot 8b] Even a heavenly decree for seventy years of good can be reversed if one perverts his mouth with improper speech.

3) Bible - [Ephesians 5:4] Neither should there be vulgar speech, foolish talk, or coarse jesting – all of which are out of character – but rather thanksgiving. 5:5 For you can be confident of this one thing: 8 that no person who is immoral, impure, or greedy (such a person is an idolater) has any inheritance in the kingdom of Christ and God.

4) A gentleman has no skill in trifles, but has strength for big task: the vulgar are skilled in trifles, but have no strength for big tasks. - Confucius, Analects, c.400 b.c.

5) Buddism - "Right Speech" : https://en.wikipedia.org/wiki/Right_speech#Right_speech

Note that I'm not sure where to look for other religions of the world.