The Book of Occultation — al-Ṭūsī · Hadith 397 (#Ḥadīth #46)

193- وقد روي أنه لما ولد لأبي الحسن عليه السلام جعفر هنئوه به فلم يروا به سرورا، فقيل له في ذلك فقال: هون عليك أمره سيضل خلقا كثيرا.

H 193 - It is narrated that when Ja’far was born to Abul Hasan , people congratulated him, but they did not see any signs of joy in him. He was asked about it. The Imam replied, “Take his birth easy; he will misguide many.”

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