The Book of Occultation — al-Ṭūsī · Hadith 576 (#Ḥadīth #24)
Chapter 43 | Special Emissaries of the Imam during the Occultation
329- قال أبوجعفر بن بابويه روي(عن) محمد بن عثمان العمري قدس سره أنه قال: والله إن صاحب هذا الامر ليحضر الموسم كل سنة يرى الناس ويعرفهم ويرونه ولا يعرفونه.
H 329 - Abu Ja’far Ibn Babawayh says: Muhammad Ibn Uthman Amari narrated that by Allah, the Master of this Affair attends the Hajj every year; he sees the people and knows them and they also see him, but don’t recognize him.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).