On silence Except when Speaking what is Good, Abandonment of what does not concern one, and Slander — Hadith 12

12. ʿUthmān ibn ʿĪsā narrated from ʿUmayr [1] ibn Udhaynah, from Sulaymān ibn Qays who said, “I heard Amīr al-Muʾminīn (a) say, ‘The Messenger of Allah (ṣ) said, “Verily Allah has forbidden Paradise to every foul-mouthed, obscene, shameless person who does not care about what he utters and what is said to him. If you investigate him, you will not find him but of illegitimate birth or a partner of Satan. ” Upon hearing this, one man asked, “O Messenger of Allah, are there really people who are partners of Satan? ” He (ṣ) replied, “Have you not read the statement of Allah [where he tells Satan]: And partner with them in their wealth and children (Q17: 64)? ” Then someone asked, “And are there [really] some people who do not care about what they utter or what is said to them? ” So he (ṣ) responded, “Yes. He who criticizes the people and speaks [negatively] about them while he knows that they will not leave him [and will react against what he has said]; such a person does not care about what he utters and what is said to him. ”’”