A single hadith about the 12th Imam's occultation (mahhr) from Imam Ja'far as-Sadiq (as)

Sadir al-Sayrafi says: I heard from Imam Abu Abdullah Ja'far As-Sadiq that: Our modest Imam, to whom this occultation belongs [the Mahdi], who is deprived of and denied his rights, will move among them and wander through their markets and walk where they walk, but they will not recognize him.