The Book of Occultation — al-Ṭūsī · Hadith 676 (#Ḥadīth #2)

410- كما روي عن النبي صلى الله عليه وآله (أنه قال:) لو لم يبق من الدنيا إلا يوم واحد لطول الله ذلك اليوم حتى يخرج رجل من ولدي فيملا الارض عدلاً وقسطاً كما ملئت ظلماً وجوراً.

H 410 - The Holy Prophet (s) said: “Even if only a day remains from the tenure of the world, Allah, the Mighty and Sublime, would prolong it enough to allow a man from my progeny to appear. Then he would fill up the earth with justice and equity just as it would be fraught with injustice and oppression.”

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