Proverbs 25:23

Perhaps you do not want a friend to hear your words. So you whisper. Your friend might not hear your actual words. But he knows that you are whispering. So your friend guesses that your words are not good. Or he guesses that you are gossiping. And he is angry.

If you whisper about another person, someone else may repeat your words to that person. Then you can expect an angry reaction from that person. As the wind brings rain, your whisper will cause this angry reaction.