Kitāb al-Ghayba

Hadith 410
imam-mahdioccultation
203- وبهذا الاسناد، عن عمرو الاهوازي قال:أراني أبو محمد عليه السلام إبنه وقال:هذا صاحبكم من بعدي.
H 203 - From the same chains of narrators, it is narrated from Amr Ahwazi that he said: Abu Muhammad (a.s) showed me his son and said: “This is your master after me.”
Source: Shaykh Muḥammad b. al-Ḥasan al-Ṭūsī