Ali, from his father, and Muhammad ibn Isma'il, from Al-Fadl ibn Shadhan, both from Ibn Abi Umayr, from Hisham ibn Al-Hakam, who said:
I saw Imam Musa ibn Ja'far عليه السلام offering condolences both before and after the burial.
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 491