Rudbari

Abu Ali al-Rudbari or 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.
Further reading.
Murtaza Muṭahharī, "Understanding Islamic sciences: philosophy, theology, mysticism, morality, jurisprudence", ICAS Press, 2002