The Book of Occultation — al-Ṭūsī · Hadith 294 (#Ḥadīth #2)
Chapter 27 | Traditions of the Holy Imams on the occultation of Imam Mahdi
ونحن نذكر من الأخبار التي تضمن ذلك طرفا ليعلم صحة ما قلناه لأن استيفاء جميع ما روي في هذا المعنى يطول وهو موجود في كتب الأخبار من اراده وقف عليه من هناك.
We only mention a few narrations that carry this meaning, to indicate the veracity of our claim, because complete incorporation of all narrations in this regard will be long and they are present in books of traditions and can be referred there.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).