Besides the book Al-Kafi by al-Kulayni, are there other sources of ahadith in which Imam Jaffar as-Sadiq (A.S) discusses Divine designation – Nass – and knowledge – ilm – inherited by one Imam from another.
You may refer to:
1. The Right Path by Sharaf ud-Din.
2. al-Ghadeer by Allamah Amini.
3. Imamate by S. S. Akhtar Rizvi.