If someone calls your mother black, would you respond to him like Imam Baqir?

An adherent of a revealed religion (kitabi) attacked the Ima`m, was aggressive towards him, and addressed him with bitter words:

 “You are baqar (cows). 

However, the Imam treated him kindly. He smiled at him, saying: 

“No, I am Ba`qir.

The adherent went on attacking the Imam, saying: “You are the son of the cook. 
The Imam smiled at him. This aggression did not excite him. Rather he said to him: 

“That is her job. 

Still the adherent went on attacking the Imam, saying:

You are the son of the black woman…. 

The Ima`m did not become angry. Rather he treated him kindly, saying: 

If you are truthful, may Allah forgive you. If you are a liar, may Allah forgive you. 

Thus, the adherent admired the Ima`m’s high morals that marked the morals of the prophets. Then he became Moslem.

• (A’yan al-Shi’a, 4/Q1/504)