The Book of Occultation — al-Ṭūsī · Hadith 387 (#Ḥadīth #36)

وما دللنا عليه من أن الزمان لا يخلو من إمام عقلا وشرعا يفسد هذا القول أيضا.

Our rational and narrational arguments that the earth does not remain devoid of an Imam also invalidates this assertion.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).