One of the companions of Imam Sajjad (A.S) has narrated that a relative of Imam (A.S) insulted and misnamed him in presence of some of the companions. Imam sajjad (A.S), however, did not answer him. After a while, Imam (A.S) told his companions, “You heard the insult of this man. Now I want to go and answer him. Come with me if you want.” The companions accompanied Imam Sajjad (A.S) to the insulter man’s house and heard Imam (A.S) reciting this Quranic verse,
“Those who restrain anger, and pardon (all) men; for God loves those who do good.” [3:134]
When they arrived at the house of that man, he came out angrily and offensively, since he thought Ali Ibn Hussayn (A.S) had come to treat him as he had done. Then Imam Sajjad (A.S) told him, “O brother! You said some words about me. If what you said is true, I repent, but if it is false, May Allah forgives your sins.” The man regretted his speech, kissed the forehead of Imam (A.S), and said, “I said things which are not true about you and deserve myself.” [Biharul Anwar, Vol 46, p 54.]