What are hadiths about evil? Examples of hadiths about evil…
According to Abu Hurayra (ra), the Messenger of Allah (saw) said, “The worst among the people is one who is two-faced; he comes to some people with one face and to others with another face.” (Muslim, al-Birr, 98)
Nawwas b. Samʿan (ra) said, “I stayed with the Messenger of Allah (saw) for one year in Medina… I asked him about righteousness and sin. Thereupon the Messenger of Allah (saw) said, ‘Righteousness is good behavior and sin is what is contrived in your mind and you do not want people to know of it.’” (Muslim, al-Birr, 15)
According to Abu Dharr (ra), the Messenger of Allah (saw) said, “Have fear of Allah wherever you are, and follow an evil deed with a good one to wipe it out, and treat the people with good behavior.” (al-Tirmidhi, al-Birr, 55)
According to Shutayr b. Shakal his father Shakal b. Humayd (ra) said, “I came to the Prophet (saw) and said, ‘O Messenger of Allah! Teach me a way of seeking refuge (in Allah) so that I may seek refuge by it.’ The Prophet (saw) took my hand and said, ‘Say, “O Allah! I seek refuge in You from the evil of my hearing and the evil of my sight, and the evil of my tongue and the evil of my heart, and the evil of my genitalia.”’” (al-Tirmidhi, al-Daʿawat, 74)
Source: Presidency Of Religious Affairs The Turkey, Islam Through Hadiths