Imam al-Baqir (a) narrated:
Salman al-Farsi -the Persian- and Omar were among some companions who began mentioning their tribes and lineages proudly. Omar asked Salman: “What is your tribe?” Salman answered: “I am Salman the son of God’s servant. I was astray, but God guided me thr ough Mohammed. I was poor, but God made me rich through Mohammed. I was slave, but God set me free through Mohammed. This is my lineage, Omar.”
As he was told of the previous discussion, the Prophet (s) commented: “People of Koreish! A man’s lineage is his religion, personality is his moralities, and origin is his intellect. Allah says: People, We have created you all male and female and have ma de you nations and tribes so that you would recognize each other. The most honorable among you in the sight of Allah is the most pious of you (49:13).”
He (s) turned to Salman and said: “Salman! No one of those is preferable to you by any means except piety. You are preferable to him whom you are more pious than he is.” ( Bihar ul-Anwar; vol. 15 part 2 page 95 )