I. Usul al-Kafi, Hadith #2542, Chapter 119 (Hadith #2)
" 'Ali bin Ibrahim narrated from his father from Ibn Abu 'Umayr from Hisham bin Salim, and Durust bin Abu Mansur from Abu 'Abdullah (sixth Imam, Ja'far al-Sadiq): 'The Messenger of God has said, 'Whoever practices racial discrimination or it is practiced for him has removed the collar of belief from his neck.' "
II. Usul al-Kafi, Hadith #2547, Chapter 119 (Hadith #7)
" 'Ali bin Ibrahim narrated from his father and 'Ali bin Muhammad al-Qasani from al-Qasim bin Muhammad from al-Minqari from 'Abd al-Razzaq from Mu'ammar from al-Zuhri who said: 'Once, 'Ali bin Husayn (fourth Imam) was asked about racist feelings. He said, 'The racist feeling that is a sin is the one that makes a person consider the evil-doers of his own people to be better than the virtuous individuals of another people. A man's loving his own people is not racism, but it is a sin to help one's own people to commit injustice."
