The Book of Occultation — al-Ṭūsī · Hadith 102 (#Ḥadīth #19)

42- قال وحدثني الحسين بن علي بن معمر عن أبيه عن عبد الله بن سنان قال سمعت أبا عبد الله عليه السلام، وذكر البداء لله، فقال: فما أخرج الله إلى الملائكة وأخرجه الملائكة إلى الرسل فأخرجه الرسل إلى الآدميين فليس فيه بداء وإن من المحتوم أن ابني هذا هو القائم.

H 42 - Narrated to me Husain bin Ali bin Muammar from his father from Abdullah bin Sinan that: I heard from Imam Ja’far Sadiq that he said with regard to change of destiny (Bada) by Allah: That which Almighty Allah gave to the angels, they conveyed it to the prophets and the prophets in turn conveyed to the people [law of religion]. Therefore, in this instance it is not Bada, because it is called definite (Mahtum); and among the definite matters is that this son of mine is the Qaim.

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