فلما مضى أبوعمرو عثمان بن سعيد قام ابنه أبوجعفر محمد بن عثمان مقامه بنص أبي محمد عليه السلام عليه ونص أبيه عثمان عليه بأمر القائم عليه السلام.
When Abu Amr Uthman Ibn Saeed died, his son Abu Ja’far Muhammad Ibn Uthman stood in his place, as the representative of the Qaim  on the virtue of clear instructions of Imam Hasan Askari  and the instructions of his father.