The Book of Occultation — al-Ṭūsī · Hadith 224 (#Ḥadīth #10)
Chapter 23 | Concealed Birth of the Imam of the Time was not an extraordinary event
فأما بعد انقراض أصحاب أبيه فقد كان مدة من الزمان أخباره واصلة من جهة السفراء الذين بينه وبين شيعته ويوثق بقولهم ويرجع إليهم لدينهم وأمانتهم وما اختصوا به من الدين والنزاهة وربما ذكرنا طرفا من أخبارهم فيما بعد.
After the companions of his father, communication was intact with him through the emissaries between him and his Shia, whose words were trusted and whose piety and trustworthiness made them reliable. We may bring some of their narratives in this regard in the future.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).