What is "rudbari"

Abu Ali al-Rudbarior Abuzer Rudbari , known also as Rudbari, was a famous early Persian sufi saint of the 9th century. He claimed descent from the Sassanid king Anushiravan and was a disciple of Junayd Baghdadi.

Rudbari's statements are recounted in many sayings of the Islamic world. One of his most famous sayings is:

No prison confines more closely than the society of those whose outlook is contrary to one's own.