The Sufficient (Vol 1) · Hadith 751 (#Ḥadīth #4)
Chapter 63 | Proof that Imamat (leadership with Divine Authority) Continues in the Descendents of the Preceding Imam but not through his Brother or Paternal Uncle or other such Relatives
4ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي نَجْرَانَ عَنْ سُلَيْمَانَ بْنِ جَعْفَرٍ الْجَعْفَرِيِّ عَنْ حَمَّادِ بْنِ عِيسَى عَنْ أَبِي عَبْدِ الله أَنَّهُ قَالَ لا تَجْتَمِعُ الامَامَةُ فِي أَخَوَيْنِ بَعْدَ الْحَسَنِ وَالْحُسَيْنِ إِنَّمَا هِيَ فِي الاعْقَابِ وَأَعْقَابِ الاعْقَابِ.
4. Muhammad ibn Yahya has narrated from Muhammad ibn al Husayn from ‘Abd al-Rahman ibn abu Najran from Sulayman ibn Ja‘fari from Hammad ibn ‘Isa from abu ‘Abdallah who has said the following. “Imamat (Leadership with Divine Authority) does not take place in two brothers after al-Hassan and al-Husayn . It only continues in the descendents of the Imam generation after the generation.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).