3 Reasons why Salman Al-Farsi was called Salman Al-Muhammadi

[Amaali of Sh Tousi 1:133]

Mohamed Bin Yusuf narrated from Mansour bin Borzaj who said:
I said to Abu Abdillah Jafar bin Muhammad, 'O my master, you mention Salman Al-Farsi frequently.'
Abu Abdillah said, 'Do not call him Salman Al-Farsi. Call him Salman Al-Muhammadi. Do you know why I mention him frequently?'
'No' I replied.
Abu Abdillah said, 'For three reasons:First, he always used to give preference to the desires of the Commander of the Believers (as) over his own desires;
Second, he used to love the needy and choose them as his friends instead of the wealthy and powerful ones;
Third, he used to love knowledge and the knowledgeable ones.
Verily Salman was a righteous slave. He was an upright Muslim and he was not among the polythiests.'