The Book of Occultation — al-Ṭūsī · Hadith 683 (#Ḥadīth #9)
Chapter 50 | Time of reappearance of the Imam
416- الفضل بن شاذان، عن محمد بن علي، عن سعدان بن مسلم، عن أبي بصير قال: قلت له: ألهذا الامر أمد نريح إليه أبداننا وننتهي إليه؟ قال: بلى، ولكنكم أذعتم فزاد الله فيه.
H 416 - It is narrated from Fadhl bin Shazan from Muhammad bin Ali from Sadan bin Muslim from Abu Basir that he asked the Imam : “Is there a fixed time for reappearance; so that we can sit quietly till that time?” He replied: “It was fixed; but you people publicized it and it was postponed.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).