Sayyiduna Abu Umamah (may Allah be pleased with him) said: A foul-tongued woman, well known for this habit, came to the Prophet (peace and blessings be upon him) while there was some dried meat in front of him (peace and blessings be upon him) which he (peace and blessings be upon him) was eating. He (peace and blessings be upon him) took a piece of dried meat that had sinew in it and put it in his mouth, chewing it sometimes on this side and sometimes on the other. The woman said: O Prophet of Allah! Will you not feed me? He said: "Of course." So he (peace and blessings be upon him) gave her some of what was in front of him. She said: No, only what is in your mouth. So he (peace and blessings be upon him) took it out and gave it to her. She took it, put it in her mouth and kept chewing it until she swallowed it. After that incident, the foul-tongued sharpness that she used to have was never again known of that woman.
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7872