Imam Sadiq [A.S] said: "He who seeks the company of those who insult the lovers of Allah has surely disobeyed Him, the Sublime."
Usul-i-Kafi, vol. 2, p. 379
Imam Sadiq [A.S] said: "When you are informed of a fellow companion committing an evil action, then go to him and tell him: 'O so and so! Either refrain from committing this sin or keep away from us'; then, avoid him unless he does so."
Wasa'il-ush-Shi'ah, vol. 16, p. 146
Imam Amir-ul-Mu'mineen Ali [A.S] said: "O' Kumayl! Say what is just in any condition. Be friends with the righteous and avoid the evil doers, stay away from the hypocrites and do not accompany the treacherous."
Mustadrak-ul-Wasa'il, vol. 12, p. 197
The Holy Prophet [A.S] said: "He who decreases a grief out of the grieves of this world for his Muslim brother, Allah will decrease for him a grief out of the grieves of the Hereafter."
People of Kufa wrote letters to Imam Hosein and invited him to their city to be their leader but when Hosein arrived, people wore their battle clothes, and surrounded Hosein and his family, and did not let them drink water ... Hosein's Brother, Abbas , went into enemies, killed many and filled the water-skin, but in return, yazid's army shoot rain of arrows toward him, and cut his both hands ... when Imam Hosein came on his body, Abbas asked his brother not to bring back his body because he do not want to be shameful in front of thirsty