The Book of Occultation — al-Ṭūsī · Hadith 663 (#Ḥadīth #5)

399- وروي في خبر آخر: أن في صاحب الزمان عليه السلام شبها من يونس؛رجوعه من غيبته بشرخ الشباب.

H 399 - It is mentioned in another report that: There is a similarity between Prophet Yunus and Imam Mahdi ; and it is that he would return from his occultation as a young man.

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