The Sufficient (Vol 1) · Hadith 836 (#Ḥadīth #9)
Chapter 73 | Tacit and Explicit Testimony as proof of abu Ja‘far al-Thani’s (the second) Divine Authority over the people after abu al-Hassan al-Rida
9ـ عَنْهُ عَنْ مُحَمَّدِ بْنِ عَلِيٍّ عَنْ أَبِي يَحْيَى الصَّنْعَانِيِّ قَالَ كُنْتُ عِنْدَ أَبِي الْحَسَنِ الرِّضَا فَجِيءَ بِابْنِهِ ابي جعفر وَهُوَ صَغِيرٌ فَقَالَ هَذَا الْمَوْلُودُ الَّذِي لَمْ يُولَدْ مَوْلُودٌ أَعْظَمُ بَرَكَةً عَلَى شِيعَتِنَا مِنْهُ.
9. It is narrated from him (Ahmad ibn Mihran) from Muhammad ibn Ali from abu Yahya al-San‘ani who has said the following. “Once I was in of abu al-Hassan al-Rida Someone brought his son, Ja’far to him and he was a small (child). The Imams said, “This new born is one the like of whom with such great holiness and blessing has not been born for our Shi‘a (followers).”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).